// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package http

import (
	"archive/tar"
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"flag"
	"fmt"
	"io"
	"io/ioutil"
	"math/big"
	"mime/multipart"
	"net/http"
	"net/url"
	"os"
	"path"
	"strconv"
	"strings"
	"testing"
	"time"

	"github.com/ethereum/go-ethereum/swarm/storage/feed/lookup"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/log"
	"github.com/ethereum/go-ethereum/swarm/api"
	"github.com/ethereum/go-ethereum/swarm/storage"
	"github.com/ethereum/go-ethereum/swarm/storage/feed"
	"github.com/ethereum/go-ethereum/swarm/testutil"
)

func init() {
	loglevel := flag.Int("loglevel", 2, "loglevel")
	flag.Parse()
	log.Root().SetHandler(log.CallerFileHandler(log.LvlFilterHandler(log.Lvl(*loglevel), log.StreamHandler(os.Stderr, log.TerminalFormat(true)))))
}

func serverFunc(api *api.API) TestServer {
	return NewServer(api, "")
}

func newTestSigner() (*feed.GenericSigner, error) {
	privKey, err := crypto.HexToECDSA("deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef")
	if err != nil {
		return nil, err
	}
	return feed.NewGenericSigner(privKey), nil
}

// Test the transparent resolving of feed updates with bzz:// scheme
//
// First upload data to bzz:, and store the Swarm hash to the resulting manifest in a feed update.
// This effectively uses a feed to store a pointer to content rather than the content itself
// Retrieving the update with the Swarm hash should return the manifest pointing directly to the data
// and raw retrieve of that hash should return the data
func TestBzzWithFeed(t *testing.T) {

	signer, _ := newTestSigner()

	// Initialize Swarm test server
	srv := NewTestSwarmServer(t, serverFunc, nil)
	defer srv.Close()

	// put together some data for our test:
	dataBytes := []byte(`
	//
	// Create some data our manifest will point to. Data that could be very big and wouldn't fit in a feed update.
	// So what we are going to do is upload it to Swarm bzz:// and obtain a **manifest hash** pointing to it:
	//
	// MANIFEST HASH --> DATA
	//
	// Then, we store that **manifest hash** into a Swarm Feed update. Once we have done this,
	// we can use the **feed manifest hash** in bzz:// instead, this way: bzz://feed-manifest-hash.
	//
	// FEED MANIFEST HASH --> MANIFEST HASH --> DATA
	//
	// Given that we can update the feed at any time with a new **manifest hash** but the **feed manifest hash**
	// stays constant, we have effectively created a fixed address to changing content. (Applause)
	//
	// FEED MANIFEST HASH (the same) --> MANIFEST HASH(2) --> DATA(2) ...
	//
	`)

	// POST data to bzz and get back a content-addressed **manifest hash** pointing to it.
	resp, err := http.Post(fmt.Sprintf("%s/bzz:/", srv.URL), "text/plain", bytes.NewReader([]byte(dataBytes)))
	if err != nil {
		t.Fatal(err)
	}

	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("err %s", resp.Status)
	}
	manifestAddressHex, err := ioutil.ReadAll(resp.Body)

	if err != nil {
		t.Fatal(err)
	}

	manifestAddress := common.FromHex(string(manifestAddressHex))

	log.Info("added data", "manifest", string(manifestAddressHex))

	// At this point we have uploaded the data and have a manifest pointing to it
	// Now store that manifest address in a feed update.
	// We also want a feed manifest, so we can use it to refer to the feed.

	// First, create a topic for our feed:
	topic, _ := feed.NewTopic("interesting topic indeed", nil)

	// Create a feed update request:
	updateRequest := feed.NewFirstRequest(topic)

	// Store the **manifest address** as data into the feed update.
	updateRequest.SetData(manifestAddress)

	// Sign the update
	if err := updateRequest.Sign(signer); err != nil {
		t.Fatal(err)
	}
	log.Info("added data", "data", common.ToHex(manifestAddress))

	// Build the feed update http request:
	feedUpdateURL, err := url.Parse(fmt.Sprintf("%s/bzz-feed:/", srv.URL))
	if err != nil {
		t.Fatal(err)
	}
	query := feedUpdateURL.Query()
	body := updateRequest.AppendValues(query) // this adds all query parameters and returns the data to be posted
	query.Set("manifest", "1")                // indicate we want a feed manifest back
	feedUpdateURL.RawQuery = query.Encode()

	// submit the feed update request to Swarm
	resp, err = http.Post(feedUpdateURL.String(), "application/octet-stream", bytes.NewReader(body))
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("err %s", resp.Status)
	}

	feedManifestAddressHex, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}
	feedManifestAddress := &storage.Address{}
	err = json.Unmarshal(feedManifestAddressHex, feedManifestAddress)
	if err != nil {
		t.Fatalf("data %s could not be unmarshaled: %v", feedManifestAddressHex, err)
	}

	correctManifestAddrHex := "747c402e5b9dc715a25a4393147512167bab018a007fad7cdcd9adc7fce1ced2"
	if feedManifestAddress.Hex() != correctManifestAddrHex {
		t.Fatalf("Response feed manifest address mismatch, expected '%s', got '%s'", correctManifestAddrHex, feedManifestAddress.Hex())
	}

	// get bzz manifest transparent feed update resolve
	getBzzURL := fmt.Sprintf("%s/bzz:/%s", srv.URL, feedManifestAddress)
	resp, err = http.Get(getBzzURL)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("err %s", resp.Status)
	}
	retrievedData, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}
	if !bytes.Equal(retrievedData, []byte(dataBytes)) {
		t.Fatalf("retrieved data mismatch, expected %x, got %x", dataBytes, retrievedData)
	}
}

// Test Swarm feeds using the raw update methods
func TestBzzFeed(t *testing.T) {
	srv := NewTestSwarmServer(t, serverFunc, nil)
	signer, _ := newTestSigner()

	defer srv.Close()

	// data of update 1
	update1Data := testutil.RandomBytes(1, 666)
	update1Timestamp := srv.CurrentTime
	//data for update 2
	update2Data := []byte("foo")

	topic, _ := feed.NewTopic("foo.eth", nil)
	updateRequest := feed.NewFirstRequest(topic)
	updateRequest.SetData(update1Data)

	if err := updateRequest.Sign(signer); err != nil {
		t.Fatal(err)
	}

	// creates feed and sets update 1
	testUrl, err := url.Parse(fmt.Sprintf("%s/bzz-feed:/", srv.URL))
	if err != nil {
		t.Fatal(err)
	}
	urlQuery := testUrl.Query()
	body := updateRequest.AppendValues(urlQuery) // this adds all query parameters
	urlQuery.Set("manifest", "1")                // indicate we want a manifest back
	testUrl.RawQuery = urlQuery.Encode()

	resp, err := http.Post(testUrl.String(), "application/octet-stream", bytes.NewReader(body))
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("err %s", resp.Status)
	}
	b, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}
	rsrcResp := &storage.Address{}
	err = json.Unmarshal(b, rsrcResp)
	if err != nil {
		t.Fatalf("data %s could not be unmarshaled: %v", b, err)
	}

	correctManifestAddrHex := "bb056a5264c295c2b0f613c8409b9c87ce9d71576ace02458160df4cc894210b"
	if rsrcResp.Hex() != correctManifestAddrHex {
		t.Fatalf("Response feed manifest mismatch, expected '%s', got '%s'", correctManifestAddrHex, rsrcResp.Hex())
	}

	// get the manifest
	testRawUrl := fmt.Sprintf("%s/bzz-raw:/%s", srv.URL, rsrcResp)
	resp, err = http.Get(testRawUrl)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("err %s", resp.Status)
	}
	b, err = ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}
	manifest := &api.Manifest{}
	err = json.Unmarshal(b, manifest)
	if err != nil {
		t.Fatal(err)
	}
	if len(manifest.Entries) != 1 {
		t.Fatalf("Manifest has %d entries", len(manifest.Entries))
	}
	correctFeedHex := "0x666f6f2e65746800000000000000000000000000000000000000000000000000c96aaa54e2d44c299564da76e1cd3184a2386b8d"
	if manifest.Entries[0].Feed.Hex() != correctFeedHex {
		t.Fatalf("Expected manifest Feed '%s', got '%s'", correctFeedHex, manifest.Entries[0].Feed.Hex())
	}

	// take the chance to have bzz: crash on resolving a feed update that does not contain
	// a swarm hash:
	testBzzUrl := fmt.Sprintf("%s/bzz:/%s", srv.URL, rsrcResp)
	resp, err = http.Get(testBzzUrl)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode == http.StatusOK {
		t.Fatal("Expected error status since feed update does not contain a Swarm hash. Received 200 OK")
	}
	_, err = ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}

	// get non-existent name, should fail
	testBzzResUrl := fmt.Sprintf("%s/bzz-feed:/bar", srv.URL)
	resp, err = http.Get(testBzzResUrl)
	if err != nil {
		t.Fatal(err)
	}

	if resp.StatusCode != http.StatusNotFound {
		t.Fatalf("Expected get non-existent feed manifest to fail with StatusNotFound (404), got %d", resp.StatusCode)
	}

	resp.Body.Close()

	// get latest update through bzz-feed directly
	log.Info("get update latest = 1.1", "addr", correctManifestAddrHex)
	testBzzResUrl = fmt.Sprintf("%s/bzz-feed:/%s", srv.URL, correctManifestAddrHex)
	resp, err = http.Get(testBzzResUrl)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("err %s", resp.Status)
	}
	b, err = ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}
	if !bytes.Equal(update1Data, b) {
		t.Fatalf("Expected body '%x', got '%x'", update1Data, b)
	}

	// update 2
	// Move the clock ahead 1 second
	srv.CurrentTime++
	log.Info("update 2")

	// 1.- get metadata about this feed
	testBzzResUrl = fmt.Sprintf("%s/bzz-feed:/%s/", srv.URL, correctManifestAddrHex)
	resp, err = http.Get(testBzzResUrl + "?meta=1")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("Get feed metadata returned %s", resp.Status)
	}
	b, err = ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}
	updateRequest = &feed.Request{}
	if err = updateRequest.UnmarshalJSON(b); err != nil {
		t.Fatalf("Error decoding feed metadata: %s", err)
	}
	updateRequest.SetData(update2Data)
	if err = updateRequest.Sign(signer); err != nil {
		t.Fatal(err)
	}
	testUrl, err = url.Parse(fmt.Sprintf("%s/bzz-feed:/", srv.URL))
	if err != nil {
		t.Fatal(err)
	}
	urlQuery = testUrl.Query()
	body = updateRequest.AppendValues(urlQuery) // this adds all query parameters
	goodQueryParameters := urlQuery.Encode()    // save the query parameters for a second attempt

	// create bad query parameters in which the signature is missing
	urlQuery.Del("signature")
	testUrl.RawQuery = urlQuery.Encode()

	// 1st attempt with bad query parameters in which the signature is missing
	resp, err = http.Post(testUrl.String(), "application/octet-stream", bytes.NewReader(body))
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	expectedCode := http.StatusBadRequest
	if resp.StatusCode != expectedCode {
		t.Fatalf("Update returned %s. Expected %d", resp.Status, expectedCode)
	}

	// 2nd attempt with bad query parameters in which the signature is of incorrect length
	urlQuery.Set("signature", "0xabcd") // should be 130 hex chars
	resp, err = http.Post(testUrl.String(), "application/octet-stream", bytes.NewReader(body))
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	expectedCode = http.StatusBadRequest
	if resp.StatusCode != expectedCode {
		t.Fatalf("Update returned %s. Expected %d", resp.Status, expectedCode)
	}

	// 3rd attempt, with good query parameters:
	testUrl.RawQuery = goodQueryParameters
	resp, err = http.Post(testUrl.String(), "application/octet-stream", bytes.NewReader(body))
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	expectedCode = http.StatusOK
	if resp.StatusCode != expectedCode {
		t.Fatalf("Update returned %s. Expected %d", resp.Status, expectedCode)
	}

	// get latest update through bzz-feed directly
	log.Info("get update 1.2")
	testBzzResUrl = fmt.Sprintf("%s/bzz-feed:/%s", srv.URL, correctManifestAddrHex)
	resp, err = http.Get(testBzzResUrl)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("err %s", resp.Status)
	}
	b, err = ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}
	if !bytes.Equal(update2Data, b) {
		t.Fatalf("Expected body '%x', got '%x'", update2Data, b)
	}

	// test manifest-less queries
	log.Info("get first update in update1Timestamp via direct query")
	query := feed.NewQuery(&updateRequest.Feed, update1Timestamp, lookup.NoClue)

	urlq, err := url.Parse(fmt.Sprintf("%s/bzz-feed:/", srv.URL))
	if err != nil {
		t.Fatal(err)
	}

	values := urlq.Query()
	query.AppendValues(values) // this adds feed query parameters
	urlq.RawQuery = values.Encode()
	resp, err = http.Get(urlq.String())
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("err %s", resp.Status)
	}
	b, err = ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}
	if !bytes.Equal(update1Data, b) {
		t.Fatalf("Expected body '%x', got '%x'", update1Data, b)
	}

}

func TestBzzGetPath(t *testing.T) {
	testBzzGetPath(false, t)
	testBzzGetPath(true, t)
}

func testBzzGetPath(encrypted bool, t *testing.T) {
	var err error

	testmanifest := []string{
		`{"entries":[{"path":"b","hash":"011b4d03dd8c01f1049143cf9c4c817e4b167f1d1b83e5c6f0f10d89ba1e7bce","contentType":"","status":0},{"path":"c","hash":"011b4d03dd8c01f1049143cf9c4c817e4b167f1d1b83e5c6f0f10d89ba1e7bce","contentType":"","status":0}]}`,
		`{"entries":[{"path":"a","hash":"011b4d03dd8c01f1049143cf9c4c817e4b167f1d1b83e5c6f0f10d89ba1e7bce","contentType":"","status":0},{"path":"b/","hash":"<key0>","contentType":"application/bzz-manifest+json","status":0}]}`,
		`{"entries":[{"path":"a/","hash":"<key1>","contentType":"application/bzz-manifest+json","status":0}]}`,
	}

	testrequests := make(map[string]int)
	testrequests["/"] = 2
	testrequests["/a/"] = 1
	testrequests["/a/b/"] = 0
	testrequests["/x"] = 0
	testrequests[""] = 0

	expectedfailrequests := []string{"", "/x"}

	reader := [3]*bytes.Reader{}

	addr := [3]storage.Address{}

	srv := NewTestSwarmServer(t, serverFunc, nil)
	defer srv.Close()

	for i, mf := range testmanifest {
		reader[i] = bytes.NewReader([]byte(mf))
		var wait func(context.Context) error
		ctx := context.TODO()
		addr[i], wait, err = srv.FileStore.Store(ctx, reader[i], int64(len(mf)), encrypted)
		if err != nil {
			t.Fatal(err)
		}
		for j := i + 1; j < len(testmanifest); j++ {
			testmanifest[j] = strings.Replace(testmanifest[j], fmt.Sprintf("<key%v>", i), addr[i].Hex(), -1)
		}
		err = wait(ctx)
		if err != nil {
			t.Fatal(err)
		}
	}

	rootRef := addr[2].Hex()

	_, err = http.Get(srv.URL + "/bzz-raw:/" + rootRef + "/a")
	if err != nil {
		t.Fatalf("Failed to connect to proxy: %v", err)
	}

	for k, v := range testrequests {
		var resp *http.Response
		var respbody []byte

		url := srv.URL + "/bzz-raw:/"
		if k != "" {
			url += rootRef + "/" + k[1:] + "?content_type=text/plain"
		}
		resp, err = http.Get(url)
		if err != nil {
			t.Fatalf("Request failed: %v", err)
		}
		defer resp.Body.Close()
		respbody, err = ioutil.ReadAll(resp.Body)
		if err != nil {
			t.Fatalf("Error while reading response body: %v", err)
		}

		if string(respbody) != testmanifest[v] {
			isexpectedfailrequest := false

			for _, r := range expectedfailrequests {
				if k == r {
					isexpectedfailrequest = true
				}
			}
			if !isexpectedfailrequest {
				t.Fatalf("Response body does not match, expected: %v, got %v", testmanifest[v], string(respbody))
			}
		}
	}

	for k, v := range testrequests {
		var resp *http.Response
		var respbody []byte

		url := srv.URL + "/bzz-hash:/"
		if k != "" {
			url += rootRef + "/" + k[1:]
		}
		resp, err = http.Get(url)
		if err != nil {
			t.Fatalf("Request failed: %v", err)
		}
		defer resp.Body.Close()
		respbody, err = ioutil.ReadAll(resp.Body)
		if err != nil {
			t.Fatalf("Read request body: %v", err)
		}

		if string(respbody) != addr[v].Hex() {
			isexpectedfailrequest := false

			for _, r := range expectedfailrequests {
				if k == r {
					isexpectedfailrequest = true
				}
			}
			if !isexpectedfailrequest {
				t.Fatalf("Response body does not match, expected: %v, got %v", addr[v], string(respbody))
			}
		}
	}

	ref := addr[2].Hex()

	for _, c := range []struct {
		path          string
		json          string
		pageFragments []string
	}{
		{
			path: "/",
			json: `{"common_prefixes":["a/"]}`,
			pageFragments: []string{
				fmt.Sprintf("Swarm index of bzz:/%s/", ref),
				`<a class="normal-link" href="a/">a/</a>`,
			},
		},
		{
			path: "/a/",
			json: `{"common_prefixes":["a/b/"],"entries":[{"hash":"011b4d03dd8c01f1049143cf9c4c817e4b167f1d1b83e5c6f0f10d89ba1e7bce","path":"a/a","mod_time":"0001-01-01T00:00:00Z"}]}`,
			pageFragments: []string{
				fmt.Sprintf("Swarm index of bzz:/%s/a/", ref),
				`<a class="normal-link" href="b/">b/</a>`,
				fmt.Sprintf(`<a class="normal-link" href="/bzz:/%s/a/a">a</a>`, ref),
			},
		},
		{
			path: "/a/b/",
			json: `{"entries":[{"hash":"011b4d03dd8c01f1049143cf9c4c817e4b167f1d1b83e5c6f0f10d89ba1e7bce","path":"a/b/b","mod_time":"0001-01-01T00:00:00Z"},{"hash":"011b4d03dd8c01f1049143cf9c4c817e4b167f1d1b83e5c6f0f10d89ba1e7bce","path":"a/b/c","mod_time":"0001-01-01T00:00:00Z"}]}`,
			pageFragments: []string{
				fmt.Sprintf("Swarm index of bzz:/%s/a/b/", ref),
				fmt.Sprintf(`<a class="normal-link" href="/bzz:/%s/a/b/b">b</a>`, ref),
				fmt.Sprintf(`<a class="normal-link" href="/bzz:/%s/a/b/c">c</a>`, ref),
			},
		},
		{
			path: "/x",
		},
		{
			path: "",
		},
	} {
		k := c.path
		url := srv.URL + "/bzz-list:/"
		if k != "" {
			url += rootRef + "/" + k[1:]
		}
		t.Run("json list "+c.path, func(t *testing.T) {
			resp, err := http.Get(url)
			if err != nil {
				t.Fatalf("HTTP request: %v", err)
			}
			defer resp.Body.Close()
			respbody, err := ioutil.ReadAll(resp.Body)
			if err != nil {
				t.Fatalf("Read response body: %v", err)
			}

			body := strings.TrimSpace(string(respbody))
			if body != c.json {
				isexpectedfailrequest := false

				for _, r := range expectedfailrequests {
					if k == r {
						isexpectedfailrequest = true
					}
				}
				if !isexpectedfailrequest {
					t.Errorf("Response list body %q does not match, expected: %v, got %v", k, c.json, body)
				}
			}
		})
		t.Run("html list "+c.path, func(t *testing.T) {
			req, err := http.NewRequest(http.MethodGet, url, nil)
			if err != nil {
				t.Fatalf("New request: %v", err)
			}
			req.Header.Set("Accept", "text/html")
			resp, err := http.DefaultClient.Do(req)
			if err != nil {
				t.Fatalf("HTTP request: %v", err)
			}
			defer resp.Body.Close()
			b, err := ioutil.ReadAll(resp.Body)
			if err != nil {
				t.Fatalf("Read response body: %v", err)
			}

			body := string(b)

			for _, f := range c.pageFragments {
				if !strings.Contains(body, f) {
					isexpectedfailrequest := false

					for _, r := range expectedfailrequests {
						if k == r {
							isexpectedfailrequest = true
						}
					}
					if !isexpectedfailrequest {
						t.Errorf("Response list body %q does not contain %q: body %q", k, f, body)
					}
				}
			}
		})
	}

	nonhashtests := []string{
		srv.URL + "/bzz:/name",
		srv.URL + "/bzz-immutable:/nonhash",
		srv.URL + "/bzz-raw:/nonhash",
		srv.URL + "/bzz-list:/nonhash",
		srv.URL + "/bzz-hash:/nonhash",
	}

	nonhashresponses := []string{
		`cannot resolve name: no DNS to resolve name: "name"`,
		`cannot resolve nonhash: no DNS to resolve name: "nonhash"`,
		`cannot resolve nonhash: no DNS to resolve name: "nonhash"`,
		`cannot resolve nonhash: no DNS to resolve name: "nonhash"`,
		`cannot resolve nonhash: no DNS to resolve name: "nonhash"`,
	}

	for i, url := range nonhashtests {
		var resp *http.Response
		var respbody []byte

		resp, err = http.Get(url)

		if err != nil {
			t.Fatalf("Request failed: %v", err)
		}
		defer resp.Body.Close()
		respbody, err = ioutil.ReadAll(resp.Body)
		if err != nil {
			t.Fatalf("ReadAll failed: %v", err)
		}
		if !strings.Contains(string(respbody), nonhashresponses[i]) {
			t.Fatalf("Non-Hash response body does not match, expected: %v, got: %v", nonhashresponses[i], string(respbody))
		}
	}
}

func TestBzzTar(t *testing.T) {
	testBzzTar(false, t)
	testBzzTar(true, t)
}

func testBzzTar(encrypted bool, t *testing.T) {
	srv := NewTestSwarmServer(t, serverFunc, nil)
	defer srv.Close()
	fileNames := []string{"tmp1.txt", "tmp2.lock", "tmp3.rtf"}
	fileContents := []string{"tmp1textfilevalue", "tmp2lockfilelocked", "tmp3isjustaplaintextfile"}

	buf := &bytes.Buffer{}
	tw := tar.NewWriter(buf)
	defer tw.Close()

	for i, v := range fileNames {
		size := int64(len(fileContents[i]))
		hdr := &tar.Header{
			Name:    v,
			Mode:    0644,
			Size:    size,
			ModTime: time.Now(),
			Xattrs: map[string]string{
				"user.swarm.content-type": "text/plain",
			},
		}
		if err := tw.WriteHeader(hdr); err != nil {
			t.Fatal(err)
		}

		// copy the file into the tar stream
		n, err := io.Copy(tw, bytes.NewBufferString(fileContents[i]))
		if err != nil {
			t.Fatal(err)
		} else if n != size {
			t.Fatal("size mismatch")
		}
	}

	//post tar stream
	url := srv.URL + "/bzz:/"
	if encrypted {
		url = url + "encrypt"
	}
	req, err := http.NewRequest("POST", url, buf)
	if err != nil {
		t.Fatal(err)
	}
	req.Header.Add("Content-Type", "application/x-tar")
	req.Header.Add(SwarmTagHeaderName, "test-upload")
	client := &http.Client{}
	resp2, err := client.Do(req)
	if err != nil {
		t.Fatal(err)
	}
	if resp2.StatusCode != http.StatusOK {
		t.Fatalf("err %s", resp2.Status)
	}

	// check that the tag was written correctly
	tag := srv.Tags.All()[0]
	testutil.CheckTag(t, tag, 4, 4, 0, 4)

	swarmHash, err := ioutil.ReadAll(resp2.Body)
	resp2.Body.Close()
	if err != nil {
		t.Fatal(err)
	}

	// now do a GET to get a tarball back
	req, err = http.NewRequest("GET", fmt.Sprintf(srv.URL+"/bzz:/%s", string(swarmHash)), nil)
	if err != nil {
		t.Fatal(err)
	}
	req.Header.Add("Accept", "application/x-tar")
	resp2, err = client.Do(req)
	if err != nil {
		t.Fatal(err)
	}
	defer resp2.Body.Close()

	if h := resp2.Header.Get("Content-Type"); h != "application/x-tar" {
		t.Fatalf("Content-Type header expected: application/x-tar, got: %s", h)
	}

	expectedFileName := string(swarmHash) + ".tar"
	expectedContentDisposition := fmt.Sprintf("inline; filename=\"%s\"", expectedFileName)
	if h := resp2.Header.Get("Content-Disposition"); h != expectedContentDisposition {
		t.Fatalf("Content-Disposition header expected: %s, got: %s", expectedContentDisposition, h)
	}

	file, err := ioutil.TempFile("", "swarm-downloaded-tarball")
	if err != nil {
		t.Fatal(err)
	}
	defer os.Remove(file.Name())
	_, err = io.Copy(file, resp2.Body)
	if err != nil {
		t.Fatalf("error getting tarball: %v", err)
	}
	file.Sync()
	file.Close()

	tarFileHandle, err := os.Open(file.Name())
	if err != nil {
		t.Fatal(err)
	}
	tr := tar.NewReader(tarFileHandle)

	for {
		hdr, err := tr.Next()
		if err == io.EOF {
			break
		} else if err != nil {
			t.Fatalf("error reading tar stream: %s", err)
		}
		bb := make([]byte, hdr.Size)
		_, err = tr.Read(bb)
		if err != nil && err != io.EOF {
			t.Fatal(err)
		}
		passed := false
		for i, v := range fileNames {
			if v == hdr.Name {
				if string(bb) == fileContents[i] {
					passed = true
					break
				}
			}
		}
		if !passed {
			t.Fatalf("file %s did not pass content assertion", hdr.Name)
		}
	}

	// now check the tags endpoint
}

// TestBzzCorrectTagEstimate checks that the HTTP middleware sets the total number of chunks
// in the tag according to an estimate from the HTTP request Content-Length header divided
// by chunk size (4096). It is needed to be checked BEFORE chunking is done, therefore
// concurrency was introduced to slow down the HTTP request
func TestBzzCorrectTagEstimate(t *testing.T) {
	srv := NewTestSwarmServer(t, serverFunc, nil)
	defer srv.Close()

	for _, v := range []struct {
		toEncrypt bool
		expChunks int64
	}{
		{toEncrypt: false, expChunks: 248},
		{toEncrypt: true, expChunks: 250},
	} {
		pr, pw := io.Pipe()

		ctx, cancel := context.WithCancel(context.Background())
		defer cancel()
		addr := ""
		if v.toEncrypt {
			addr = "encrypt"
		}
		req, err := http.NewRequest("POST", srv.URL+"/bzz:/"+addr, pr)
		if err != nil {
			t.Fatal(err)
		}

		req = req.WithContext(ctx)
		req.ContentLength = 1000000
		req.Header.Add(SwarmTagHeaderName, "1000000")

		go func() {
			for {
				select {
				case <-ctx.Done():
					return
				case <-time.After(1 * time.Millisecond):
					_, err := pw.Write([]byte{0})
					if err != nil {
						t.Error(err)
					}
				}
			}
		}()
		go func() {
			transport := http.DefaultTransport
			_, err := transport.RoundTrip(req)
			if err != nil {
				t.Error(err)
			}
		}()
		done := false
		for !done {
			switch len(srv.Tags.All()) {
			case 0:
				<-time.After(10 * time.Millisecond)
			case 1:
				tag := srv.Tags.All()[0]
				testutil.CheckTag(t, tag, 0, 0, 0, v.expChunks)
				srv.Tags.Delete(tag.Uid)
				done = true
			}
		}
	}
}

// TestBzzRootRedirect tests that getting the root path of a manifest without
// a trailing slash gets redirected to include the trailing slash so that
// relative URLs work as expected.
func TestBzzRootRedirect(t *testing.T) {
	testBzzRootRedirect(false, t)
}
func TestBzzRootRedirectEncrypted(t *testing.T) {
	testBzzRootRedirect(true, t)
}

func testBzzRootRedirect(toEncrypt bool, t *testing.T) {
	srv := NewTestSwarmServer(t, serverFunc, nil)
	defer srv.Close()

	// create a manifest with some data at the root path
	data := []byte("data")
	headers := map[string]string{"Content-Type": "text/plain"}
	res, hash := httpDo("POST", srv.URL+"/bzz:/", bytes.NewReader(data), headers, false, t)
	if res.StatusCode != http.StatusOK {
		t.Fatalf("unexpected status code from server %d want %d", res.StatusCode, http.StatusOK)
	}

	// define a CheckRedirect hook which ensures there is only a single
	// redirect to the correct URL
	redirected := false
	httpClient := http.Client{
		CheckRedirect: func(req *http.Request, via []*http.Request) error {
			if redirected {
				return errors.New("too many redirects")
			}
			redirected = true
			expectedPath := "/bzz:/" + hash + "/"
			if req.URL.Path != expectedPath {
				return fmt.Errorf("expected redirect to %q, got %q", expectedPath, req.URL.Path)
			}
			return nil
		},
	}

	// perform the GET request and assert the response
	res, err := httpClient.Get(srv.URL + "/bzz:/" + hash)
	if err != nil {
		t.Fatal(err)
	}
	defer res.Body.Close()
	if !redirected {
		t.Fatal("expected GET /bzz:/<hash> to redirect to /bzz:/<hash>/ but it didn't")
	}
	gotData, err := ioutil.ReadAll(res.Body)
	if err != nil {
		t.Fatal(err)
	}
	if !bytes.Equal(gotData, data) {
		t.Fatalf("expected response to equal %q, got %q", data, gotData)
	}
}

func TestMethodsNotAllowed(t *testing.T) {
	srv := NewTestSwarmServer(t, serverFunc, nil)
	defer srv.Close()
	databytes := "bar"
	for _, c := range []struct {
		url  string
		code int
	}{
		{
			url:  fmt.Sprintf("%s/bzz-list:/", srv.URL),
			code: http.StatusMethodNotAllowed,
		}, {
			url:  fmt.Sprintf("%s/bzz-hash:/", srv.URL),
			code: http.StatusMethodNotAllowed,
		},
		{
			url:  fmt.Sprintf("%s/bzz-immutable:/", srv.URL),
			code: http.StatusMethodNotAllowed,
		},
	} {
		res, _ := http.Post(c.url, "text/plain", bytes.NewReader([]byte(databytes)))
		if res.StatusCode != c.code {
			t.Fatalf("should have failed. requested url: %s, expected code %d, got %d", c.url, c.code, res.StatusCode)
		}
	}

}

func httpDo(httpMethod string, url string, reqBody io.Reader, headers map[string]string, verbose bool, t *testing.T) (*http.Response, string) {
	// Build the Request
	req, err := http.NewRequest(httpMethod, url, reqBody)
	if err != nil {
		t.Fatal(err)
	}
	for key, value := range headers {
		req.Header.Set(key, value)
	}
	if verbose {
		t.Log(req.Method, req.URL, req.Header, req.Body)
	}

	// Send Request out
	httpClient := &http.Client{}
	res, err := httpClient.Do(req)
	if err != nil {
		t.Fatal(err)
	}

	// Read the HTTP Body
	buffer, err := ioutil.ReadAll(res.Body)
	if err != nil {
		t.Fatal(err)
	}
	defer res.Body.Close()
	body := string(buffer)

	return res, body
}

func TestGet(t *testing.T) {
	srv := NewTestSwarmServer(t, serverFunc, nil)
	defer srv.Close()

	for _, testCase := range []struct {
		uri                string
		method             string
		headers            map[string]string
		expectedStatusCode int
		assertResponseBody string
		verbose            bool
	}{
		{
			uri:                fmt.Sprintf("%s/", srv.URL),
			method:             "GET",
			headers:            map[string]string{"Accept": "text/html"},
			expectedStatusCode: http.StatusOK,
			assertResponseBody: "Swarm: Serverless Hosting Incentivised Peer-To-Peer Storage And Content Distribution",
			verbose:            false,
		},
		{
			uri:                fmt.Sprintf("%s/", srv.URL),
			method:             "GET",
			headers:            map[string]string{"Accept": "application/json"},
			expectedStatusCode: http.StatusOK,
			assertResponseBody: "Swarm: Please request a valid ENS or swarm hash with the appropriate bzz scheme",
			verbose:            false,
		},
		{
			uri:                fmt.Sprintf("%s/robots.txt", srv.URL),
			method:             "GET",
			headers:            map[string]string{"Accept": "text/html"},
			expectedStatusCode: http.StatusOK,
			assertResponseBody: "User-agent: *\nDisallow: /",
			verbose:            false,
		},
		{
			uri:                fmt.Sprintf("%s/nonexistent_path", srv.URL),
			method:             "GET",
			headers:            map[string]string{},
			expectedStatusCode: http.StatusNotFound,
			verbose:            false,
		},
		{
			uri:                fmt.Sprintf("%s/bzz:asdf/", srv.URL),
			method:             "GET",
			headers:            map[string]string{},
			expectedStatusCode: http.StatusNotFound,
			verbose:            false,
		},
		{
			uri:                fmt.Sprintf("%s/tbz2/", srv.URL),
			method:             "GET",
			headers:            map[string]string{},
			expectedStatusCode: http.StatusNotFound,
			verbose:            false,
		},
		{
			uri:                fmt.Sprintf("%s/bzz-rack:/", srv.URL),
			method:             "GET",
			headers:            map[string]string{},
			expectedStatusCode: http.StatusNotFound,
			verbose:            false,
		},
		{
			uri:                fmt.Sprintf("%s/bzz-ls", srv.URL),
			method:             "GET",
			headers:            map[string]string{},
			expectedStatusCode: http.StatusNotFound,
			verbose:            false,
		}} {
		t.Run("GET "+testCase.uri, func(t *testing.T) {
			res, body := httpDo(testCase.method, testCase.uri, nil, testCase.headers, testCase.verbose, t)
			if res.StatusCode != testCase.expectedStatusCode {
				t.Fatalf("expected status code %d but got %d", testCase.expectedStatusCode, res.StatusCode)
			}
			if testCase.assertResponseBody != "" && !strings.Contains(body, testCase.assertResponseBody) {
				t.Fatalf("expected response to be: %s but got: %s", testCase.assertResponseBody, body)
			}
		})
	}
}

func TestModify(t *testing.T) {
	srv := NewTestSwarmServer(t, serverFunc, nil)
	defer srv.Close()
	headers := map[string]string{"Content-Type": "text/plain"}
	res, hash := httpDo("POST", srv.URL+"/bzz:/", bytes.NewReader([]byte("data")), headers, false, t)
	if res.StatusCode != http.StatusOK {
		t.Fatalf("unexpected status code from server %d want %d", res.StatusCode, http.StatusOK)
	}

	for _, testCase := range []struct {
		uri                   string
		method                string
		headers               map[string]string
		requestBody           []byte
		expectedStatusCode    int
		assertResponseBody    string
		assertResponseHeaders map[string]string
		verbose               bool
	}{
		{
			uri:                fmt.Sprintf("%s/bzz:/%s", srv.URL, hash),
			method:             "DELETE",
			headers:            map[string]string{},
			expectedStatusCode: http.StatusOK,
			assertResponseBody: "8b634aea26eec353ac0ecbec20c94f44d6f8d11f38d4578a4c207a84c74ef731",
			verbose:            false,
		},
		{
			uri:                fmt.Sprintf("%s/bzz:/%s", srv.URL, hash),
			method:             "PUT",
			headers:            map[string]string{},
			expectedStatusCode: http.StatusMethodNotAllowed,
			verbose:            false,
		},
		{
			uri:                fmt.Sprintf("%s/bzz-raw:/%s", srv.URL, hash),
			method:             "PUT",
			headers:            map[string]string{},
			expectedStatusCode: http.StatusMethodNotAllowed,
			verbose:            false,
		},
		{
			uri:                fmt.Sprintf("%s/bzz:/%s", srv.URL, hash),
			method:             "PATCH",
			headers:            map[string]string{},
			expectedStatusCode: http.StatusMethodNotAllowed,
			verbose:            false,
		},
		{
			uri:                   fmt.Sprintf("%s/bzz-raw:/", srv.URL),
			method:                "POST",
			headers:               map[string]string{},
			requestBody:           []byte("POSTdata"),
			expectedStatusCode:    http.StatusOK,
			assertResponseHeaders: map[string]string{"Content-Length": "64"},
			verbose:               false,
		},
		{
			uri:                   fmt.Sprintf("%s/bzz-raw:/encrypt", srv.URL),
			method:                "POST",
			headers:               map[string]string{},
			requestBody:           []byte("POSTdata"),
			expectedStatusCode:    http.StatusOK,
			assertResponseHeaders: map[string]string{"Content-Length": "128"},
			verbose:               false,
		},
	} {
		t.Run(testCase.method+" "+testCase.uri, func(t *testing.T) {
			reqBody := bytes.NewReader(testCase.requestBody)
			res, body := httpDo(testCase.method, testCase.uri, reqBody, testCase.headers, testCase.verbose, t)

			if res.StatusCode != testCase.expectedStatusCode {
				t.Fatalf("expected status code %d but got %d, %s", testCase.expectedStatusCode, res.StatusCode, body)
			}
			if testCase.assertResponseBody != "" && !strings.Contains(body, testCase.assertResponseBody) {
				t.Log(body)
				t.Fatalf("expected response %s but got %s", testCase.assertResponseBody, body)
			}
			for key, value := range testCase.assertResponseHeaders {
				if res.Header.Get(key) != value {
					t.Logf("expected %s=%s in HTTP response header but got %s", key, value, res.Header.Get(key))
				}
			}
		})
	}
}

func TestMultiPartUpload(t *testing.T) {
	// POST /bzz:/ Content-Type: multipart/form-data
	verbose := false
	// Setup Swarm
	srv := NewTestSwarmServer(t, serverFunc, nil)
	defer srv.Close()

	url := fmt.Sprintf("%s/bzz:/", srv.URL)

	buf := new(bytes.Buffer)
	form := multipart.NewWriter(buf)
	form.WriteField("name", "John Doe")
	file1, _ := form.CreateFormFile("cv", "cv.txt")
	file1.Write([]byte("John Doe's Credentials"))
	file2, _ := form.CreateFormFile("profile_picture", "profile.jpg")
	file2.Write([]byte("imaginethisisjpegdata"))
	form.Close()

	headers := map[string]string{
		"Content-Type":   form.FormDataContentType(),
		"Content-Length": strconv.Itoa(buf.Len()),
	}
	res, body := httpDo("POST", url, buf, headers, verbose, t)

	if res.StatusCode != http.StatusOK {
		t.Fatalf("expected POST multipart/form-data to return 200, but it returned %d", res.StatusCode)
	}
	if len(body) != 64 {
		t.Fatalf("expected POST multipart/form-data to return a 64 char manifest but the answer was %d chars long", len(body))
	}
}

// TestBzzGetFileWithResolver tests fetching a file using a mocked ENS resolver
func TestBzzGetFileWithResolver(t *testing.T) {
	resolver := newTestResolveValidator("")
	srv := NewTestSwarmServer(t, serverFunc, resolver)
	defer srv.Close()
	fileNames := []string{"dir1/tmp1.txt", "dir2/tmp2.lock", "dir3/tmp3.rtf"}
	fileContents := []string{"tmp1textfilevalue", "tmp2lockfilelocked", "tmp3isjustaplaintextfile"}

	buf := &bytes.Buffer{}
	tw := tar.NewWriter(buf)

	for i, v := range fileNames {
		size := len(fileContents[i])
		hdr := &tar.Header{
			Name:    v,
			Mode:    0644,
			Size:    int64(size),
			ModTime: time.Now(),
			Xattrs: map[string]string{
				"user.swarm.content-type": "text/plain",
			},
		}
		if err := tw.WriteHeader(hdr); err != nil {
			t.Fatal(err)
		}

		// copy the file into the tar stream
		n, err := io.WriteString(tw, fileContents[i])
		if err != nil {
			t.Fatal(err)
		} else if n != size {
			t.Fatal("size mismatch")
		}
	}

	if err := tw.Close(); err != nil {
		t.Fatal(err)
	}

	//post tar stream
	url := srv.URL + "/bzz:/"

	req, err := http.NewRequest("POST", url, buf)
	if err != nil {
		t.Fatal(err)
	}
	req.Header.Add("Content-Type", "application/x-tar")
	client := &http.Client{}
	serverResponse, err := client.Do(req)
	if err != nil {
		t.Fatal(err)
	}
	if serverResponse.StatusCode != http.StatusOK {
		t.Fatalf("err %s", serverResponse.Status)
	}
	swarmHash, err := ioutil.ReadAll(serverResponse.Body)
	serverResponse.Body.Close()
	if err != nil {
		t.Fatal(err)
	}
	// set the resolved hash to be the swarm hash of what we've just uploaded
	hash := common.HexToHash(string(swarmHash))
	resolver.hash = &hash
	for _, v := range []struct {
		addr                string
		path                string
		expectedStatusCode  int
		expectedContentType string
		expectedFileName    string
	}{
		{
			addr:                string(swarmHash),
			path:                fileNames[0],
			expectedStatusCode:  http.StatusOK,
			expectedContentType: "text/plain",
			expectedFileName:    path.Base(fileNames[0]),
		},
		{
			addr:                "somebogusensname",
			path:                fileNames[0],
			expectedStatusCode:  http.StatusOK,
			expectedContentType: "text/plain",
			expectedFileName:    path.Base(fileNames[0]),
		},
	} {
		req, err := http.NewRequest("GET", fmt.Sprintf(srv.URL+"/bzz:/%s/%s", v.addr, v.path), nil)
		if err != nil {
			t.Fatal(err)
		}
		serverResponse, err := client.Do(req)
		if err != nil {
			t.Fatal(err)
		}
		defer serverResponse.Body.Close()
		if serverResponse.StatusCode != v.expectedStatusCode {
			t.Fatalf("expected %d, got %d", v.expectedStatusCode, serverResponse.StatusCode)
		}

		if h := serverResponse.Header.Get("Content-Type"); h != v.expectedContentType {
			t.Fatalf("Content-Type header expected: %s, got %s", v.expectedContentType, h)
		}

		expectedContentDisposition := fmt.Sprintf("inline; filename=\"%s\"", v.expectedFileName)
		if h := serverResponse.Header.Get("Content-Disposition"); h != expectedContentDisposition {
			t.Fatalf("Content-Disposition header expected: %s, got: %s", expectedContentDisposition, h)
		}

	}
}

// TestCalculateNumberOfChunks is a unit test for the chunk-number-according-to-content-length
// calculation
func TestCalculateNumberOfChunks(t *testing.T) {

	//test cases:
	for _, tc := range []struct{ len, chunks int64 }{
		{len: 1000, chunks: 1},
		{len: 5000, chunks: 3},
		{len: 10000, chunks: 4},
		{len: 100000, chunks: 26},
		{len: 1000000, chunks: 248},
		{len: 325839339210, chunks: 79550620 + 621490 + 4856 + 38 + 1},
	} {
		res := calculateNumberOfChunks(tc.len, false)
		if res != tc.chunks {
			t.Fatalf("expected result for %d bytes to be %d got %d", tc.len, tc.chunks, res)
		}
	}
}

// TestCalculateNumberOfChunksEncrypted is a unit test for the chunk-number-according-to-content-length
// calculation with encryption (branching factor=64)
func TestCalculateNumberOfChunksEncrypted(t *testing.T) {

	//test cases:
	for _, tc := range []struct{ len, chunks int64 }{
		{len: 1000, chunks: 1},
		{len: 5000, chunks: 3},
		{len: 10000, chunks: 4},
		{len: 100000, chunks: 26},
		{len: 1000000, chunks: 245 + 4 + 1},
		{len: 325839339210, chunks: 79550620 + 1242979 + 19422 + 304 + 5 + 1},
	} {
		res := calculateNumberOfChunks(tc.len, true)
		if res != tc.chunks {
			t.Fatalf("expected result for %d bytes to be %d got %d", tc.len, tc.chunks, res)
		}
	}
}

// testResolver implements the Resolver interface and either returns the given
// hash if it is set, or returns a "name not found" error
type testResolveValidator struct {
	hash *common.Hash
}

func newTestResolveValidator(addr string) *testResolveValidator {
	r := &testResolveValidator{}
	if addr != "" {
		hash := common.HexToHash(addr)
		r.hash = &hash
	}
	return r
}

func (t *testResolveValidator) Resolve(addr string) (common.Hash, error) {
	if t.hash == nil {
		return common.Hash{}, fmt.Errorf("DNS name not found: %q", addr)
	}
	return *t.hash, nil
}

func (t *testResolveValidator) Owner(node [32]byte) (addr common.Address, err error) {
	return
}

func (t *testResolveValidator) HeaderByNumber(context.Context, *big.Int) (header *types.Header, err error) {
	return
}