Use inline SVG for built-in OAuth providers (#25171) (#25234)

Backport #25171 by @silverwind

The plan is that all built-in auth providers use inline SVG for more
flexibility in styling and to get the GitHub icon to follow
`currentcolor`. This only removes the `public/img/auth` directory and
adds the missing svgs to our svg build.

It should map the built-in providers to these SVGs and render them. If
the user has set a Icon URL, it should render that as an `img` tag
instead.

```
gitea-azure-ad
gitea-bitbucket
gitea-discord
gitea-dropbox
gitea-facebook
gitea-gitea
gitea-gitlab
gitea-google
gitea-mastodon
gitea-microsoftonline
gitea-nextcloud
gitea-twitter
gitea-yandex
octicon-mark-github
```

GitHub logo is now white again on dark theme:

<img width="431" alt="Screenshot 2023-06-12 at 21 45 34"
src="https://github.com/go-gitea/gitea/assets/115237/27a43504-d60a-4132-a502-336b25883e4d">

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/svg/svg.go

@@ -62,5 +62,5 @@ func RenderHTML(icon string, others ...interface{}) template.HTML {
 		}
 		return template.HTML(svgStr)
 	}
-	return template.HTML("")
+	return ""
 }

public/img/auth/azureadv2.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 18 18" class="svg gitea-azureadv2" width="16" height="16" aria-hidden="true"><defs><linearGradient id="gitea-azureadv2__a" x1="13.25" x2="8.62" y1="13.02" y2="4.25" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#1988d9"/><stop offset=".9" stop-color="#54aef0"/></linearGradient><linearGradient id="gitea-azureadv2__b" x1="11.26" x2="14.46" y1="10.47" y2="15.99" gradientUnits="userSpaceOnUse"><stop offset=".1" stop-color="#54aef0"/><stop offset=".29" stop-color="#4fabee"/><stop offset=".51" stop-color="#41a2e9"/><stop offset=".74" stop-color="#2a93e0"/><stop offset=".88" stop-color="#1988d9"/></linearGradient></defs><path fill="#50e6ff" d="m1.01 10.19 7.92 5.14 8.06-5.16L18 11.35l-9.07 5.84L0 11.35l1.01-1.16z"/><path fill="#fff" d="M1.61 9.53 8.93.81l7.47 8.73-7.47 4.72-7.32-4.73z"/><path fill="#50e6ff" d="M8.93.81v13.45L1.61 9.53 8.93.81z"/><path fill="url(#gitea-azureadv2__a)" d="M8.93.81v13.45l7.47-4.72L8.93.81z"/><path fill="#53b1e0" d="m8.93 7.76 7.47 1.78-7.47 4.72v-6.5z"/><path fill="#9cebff" d="M8.93 14.26 1.61 9.53l7.32-1.77v6.5z"/><path fill="url(#gitea-azureadv2__b)" d="M8.93 17.19 18 11.35l-1.01-1.18-8.06 5.16v1.86z"/></svg>

public/img/auth/gitea.svg

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public/img/auth/github.svg

@@ -1 +0,0 @@
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public/img/auth/gitlab.svg

@@ -1 +0,0 @@
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public/img/svg/gitea-azuread.svg

@@ -0,0 +1 @@
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public/img/svg/gitea-azureadv2.svg

@@ -0,0 +1 @@
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public/img/svg/gitea-bitbucket.svg

@@ -0,0 +1 @@
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public/img/svg/gitea-discord.svg

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public/img/svg/gitea-dropbox.svg

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public/img/svg/gitea-facebook.svg

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public/img/svg/gitea-google.svg

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public/img/svg/gitea-mastodon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" class="gitea-mastodon__svg gitea-mastodon__gitea-mastodon svg gitea-mastodon" viewBox="-0.41 0.22 747.62 801.45" width="16" height="16"><path fill="#3088d4" d="M729.94 479.5c-10.96 56.4-98.17 118.12-198.34 130.08-52.23 6.23-103.66 11.96-158.49 9.44-89.68-4.1-160.45-21.4-160.45-21.4 0 8.73.54 17.04 1.62 24.81 11.66 88.52 87.76 93.82 159.84 96.29 72.76 2.49 137.55-17.94 137.55-17.94l2.99 65.79s-50.89 27.32-141.55 32.35c-50 2.75-112.07-1.26-184.37-20.39C31.94 737.02 4.97 569.86.85 400.26-.41 349.9.37 302.42.37 262.7.37 89.27 113.99 38.44 113.99 38.44 171.28 12.12 269.59 1.06 371.79.22h2.52c102.19.84 200.57 11.9 257.86 38.22 0 0 113.62 50.83 113.62 224.26 0 0 1.42 127.96-15.85 216.8"/><path fill="#fff" d="M611.77 276.16v209.99h-83.2V282.33c0-42.97-18.07-64.77-54.23-64.77-39.98 0-60.01 25.86-60.01 77.02v111.57h-82.71V294.58c0-51.16-20.04-77.02-60.01-77.02-36.16 0-54.24 21.8-54.24 64.77v203.82h-83.19V276.16c0-42.92 10.93-77.03 32.88-102.26 22.63-25.23 52.27-38.17 89.07-38.17 42.57 0 74.81 16.37 96.12 49.1l20.72 34.74 20.73-34.74c21.31-32.73 53.55-49.1 96.12-49.1 36.79 0 66.44 12.94 89.07 38.17 21.95 25.23 32.88 59.34 32.88 102.26z"/></svg>

public/img/svg/gitea-microsoftonline.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" class="gitea-microsoftonline__svg gitea-microsoftonline__gitea-microsoftonline svg gitea-microsoftonline" viewBox="0 0 2075 2499.8" width="16" height="16"><path fill="#eb3c00" d="M0 2016.6V496.8L1344.4 0 2075 233.7v2045.9l-730.6 220.3L0 2016.6l1344.4 161.8V409.2L467.6 613.8v1198.3z"/></svg>

public/img/svg/gitea-nextcloud.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" class="gitea-nextcloud__svg gitea-nextcloud__gitea-nextcloud svg gitea-nextcloud" style="shape-rendering:geometricPrecision;text-rendering:geometricPrecision;image-rendering:optimizeQuality;fill-rule:evenodd;clip-rule:evenodd" viewBox="0 0 128 128" width="16" height="16"><path fill="#0382c9" d="M12.5-.5h102a796.486 796.486 0 0 0 7 4.5 68.97 68.97 0 0 1 6 8.5v102a785.54 785.54 0 0 0-4.5 7 68.927 68.927 0 0 1-8.5 6h-102a779.088 779.088 0 0 0-7-4.5 68.94 68.94 0 0 1-6-8.5v-102a789.852 789.852 0 0 0 4.5-7 68.982 68.982 0 0 1 8.5-6Z" style="opacity:.997"/><path fill="#fafcfe" d="M55.5 37.5c16.649-2.824 28.149 3.51 34.5 19 6.704-10.658 15.537-12.825 26.5-6.5 9.555 10.007 9.222 19.673-1 29-10.492 5.063-18.992 2.897-25.5-6.5C83.734 86.553 72.9 92.72 57.5 91c-9.864-2.843-16.697-9.01-20.5-18.5-6.582 9.277-15.082 11.444-25.5 6.5-10.222-9.327-10.555-18.993-1-29 10.809-5.923 19.642-3.756 26.5 6.5 3.713-8.878 9.88-15.211 18.5-19Z" style="opacity:1"/><path fill="#0b83c9" d="M58.5 47.5c17.163-.677 23.996 7.323 20.5 24-6.538 9.38-15.038 11.546-25.5 6.5-10.605-12.356-8.939-22.523 5-30.5Z" style="opacity:1"/><path fill="#1986cb" d="M18.5 56.5c7.7-.138 10.867 3.529 9.5 11-4.041 4.813-8.375 5.146-13 1-1.407-4.857-.24-8.857 3.5-12Z" style="opacity:1"/><path fill="#2088cb" d="M103.5 56.5c7.801.619 10.635 4.619 8.5 12-4.709 4.27-9.042 3.936-13-1-1.607-5.062-.107-8.728 4.5-11Z" style="opacity:1"/></svg>

public/img/svg/gitea-twitter.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" fill-rule="evenodd" stroke-linejoin="round" stroke-miterlimit="2" aria-hidden="true" class="gitea-twitter__svg gitea-twitter__gitea-twitter svg gitea-twitter" clip-rule="evenodd" viewBox="-89.009 -46.884 643.937 446.884" width="16" height="16"><path fill="#1da1f2" fill-rule="nonzero" d="M154.729 400c185.669 0 287.205-153.876 287.205-287.312 0-4.37-.089-8.72-.286-13.052A205.304 205.304 0 0 0 492 47.346c-18.087 8.044-37.55 13.458-57.968 15.899 20.841-12.501 36.84-32.278 44.389-55.852a202.42 202.42 0 0 1-64.098 24.511C395.903 12.276 369.679 0 340.641 0c-55.744 0-100.948 45.222-100.948 100.965 0 7.925.887 15.631 2.619 23.025-83.895-4.223-158.287-44.405-208.074-105.504A100.739 100.739 0 0 0 20.57 69.24c0 35.034 17.82 65.961 44.92 84.055a100.172 100.172 0 0 1-45.716-12.63c-.015.424-.015.837-.015 1.29 0 48.903 34.794 89.734 80.982 98.986a101.036 101.036 0 0 1-26.617 3.553c-6.493 0-12.821-.639-18.971-1.82 12.851 40.122 50.115 69.319 94.296 70.135-34.549 27.089-78.07 43.224-125.371 43.224A204.9 204.9 0 0 1 0 354.634c44.674 28.645 97.72 45.359 154.734 45.359"/></svg>

public/img/svg/gitea-yandex.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" class="gitea-yandex__svg gitea-yandex__gitea-yandex svg gitea-yandex" viewBox="0 0 64 64" width="16" height="16"><path fill="#e52620" d="M49.07 0c.524.405.262.88.095 1.333l-6.643 18.095-8.047 22.12a4.21 4.21 0 0 0-.262 1.429v19.81c0 1.2-.024 1.2-1.214 1.2-1.238 0-2.476-.048-3.714.024-.786.024-1.07-.238-1.048-1.024l.024-7.333V42.928c0-.5-.07-1.048-.262-1.524L14.976 7.333c-.095-.262-.238-.476-.357-.714v-.5c.38-.12.762-.3 1.143-.3l4.12-.024s1.357 0 1.81 1.286l9.7 27.31.405.976.333-1.095 1.905-6.976 8.5-26.31c.12-.333.405-.62.62-.93L49.07 0z"/></svg>

services/auth/source/oauth2/providers.go

@@ -5,6 +5,9 @@ package oauth2
 
 import (
 	"errors"
+	"fmt"
+	"html"
+	"html/template"
 	"net/url"
 	"sort"
 
@@ -19,7 +22,7 @@ import (
 type Provider interface {
 	Name() string
 	DisplayName() string
-	IconURL() string
+	IconHTML() template.HTML
 	CustomURLSettings() *CustomURLSettings
 }
 
@@ -35,7 +38,7 @@ type GothProvider interface {
 }
 
 // AuthSourceProvider provides a provider for an AuthSource. Multiple auth sources could use the same registered GothProvider
-// So each auth source should have its own DisplayName and IconURL for display.
+// So each auth source should have its own DisplayName and IconHTML for display.
 // The Name is the GothProvider's name, to help to find the GothProvider to sign in.
 // The DisplayName is the auth source config's name, site admin set it on the admin page, the IconURL can also be set there.
 type AuthSourceProvider struct {
@@ -51,11 +54,14 @@ func (p *AuthSourceProvider) DisplayName() string {
 	return p.sourceName
 }
 
-func (p *AuthSourceProvider) IconURL() string {
+func (p *AuthSourceProvider) IconHTML() template.HTML {
 	if p.iconURL != "" {
-		return p.iconURL
+		img := fmt.Sprintf(`<img class="gt-mr-3" width="20" height="20" src="%s" alt="%s">`,
+			html.EscapeString(p.iconURL), html.EscapeString(p.DisplayName()),
+		)
+		return template.HTML(img)
 	}
-	return p.GothProvider.IconURL()
+	return p.GothProvider.IconHTML()
 }
 
 // Providers contains the map of registered OAuth2 providers in Gitea (based on goth)

services/auth/source/oauth2/providers_base.go

@@ -3,7 +3,12 @@
 
 package oauth2
 
-import "code.gitea.io/gitea/modules/setting"
+import (
+	"html/template"
+
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/svg"
+)
 
 // BaseProvider represents a common base for Provider
 type BaseProvider struct {
@@ -21,14 +26,21 @@ func (b *BaseProvider) DisplayName() string {
 	return b.displayName
 }
 
-// IconURL returns an icon path for this provider
-// Use svg for default icons, providers_openid has its own IconURL function
-func (b *BaseProvider) IconURL() string {
-	name := b.name
-	if b.name == "gplus" {
-		name = "google"
+// IconHTML returns icon HTML for this provider
+func (b *BaseProvider) IconHTML() template.HTML {
+	svgName := "gitea-" + b.name
+	switch b.name {
+	case "gplus":
+		svgName = "gitea-google"
+	case "github":
+		svgName = "octicon-mark-github"
+	}
+	svgHTML := svg.RenderHTML(svgName, 20, "gt-mr-3")
+	if svgHTML == "" {
+		log.Error("No SVG icon for oauth2 provider %q", b.name)
+		svgHTML = svg.RenderHTML("gitea-openid", 20, "gt-mr-3")
 	}
-	return setting.AppSubURL + "/assets/img/auth/" + name + ".svg"
+	return svgHTML
 }
 
 // CustomURLSettings returns the custom url settings for this provider

services/auth/source/oauth2/providers_openid.go

@@ -4,8 +4,11 @@
 package oauth2
 
 import (
+	"html/template"
+
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/svg"
 
 	"github.com/markbates/goth"
 	"github.com/markbates/goth/providers/openidConnect"
@@ -24,9 +27,9 @@ func (o *OpenIDProvider) DisplayName() string {
 	return "OpenID Connect"
 }
 
-// IconURL returns an icon path for this provider
-func (o *OpenIDProvider) IconURL() string {
-	return setting.AppSubURL + "/assets/img/svg/gitea-openid.svg"
+// IconHTML returns icon HTML for this provider
+func (o *OpenIDProvider) IconHTML() template.HTML {
+	return svg.RenderHTML("gitea-openid", 20, "gt-mr-3")
 }
 
 // CreateGothProvider creates a GothProvider from this Provider

templates/user/auth/signin_inner.tmpl

@@ -53,16 +53,16 @@
 	{{end}}
 
 	{{if and .OrderedOAuth2Names .OAuth2Providers}}
-	<div id="oauth2-login-navigator">
+	<div class="ui horizontal divider">
+		{{.locale.Tr "sign_in_or"}}
+	</div>
+	<div id="oauth2-login-navigator" class="gt-py-2">
 		<div class="gt-df gt-fc gt-jc">
-			<div class="ui horizontal divider">
-				{{.locale.Tr "sign_in_or"}}
-			</div>
 			<div id="oauth2-login-navigator-inner" class="gt-df gt-fc gt-fw gt-ac gt-gap-3">
 				{{range $key := .OrderedOAuth2Names}}
 					{{$provider := index $.OAuth2Providers $key}}
 					<a class="{{$provider.Name}} ui button gt-df gt-ac gt-jc gt-py-3 oauth-login-link" href="{{AppSubUrl}}/user/oauth2/{{$key}}">
-						<img class="gt-mr-3" width="20" height="20" src="{{$provider.IconURL}}" alt="{{$provider.DisplayName}}">
+						{{$provider.IconHTML}}
 						{{$.locale.Tr "sign_in_with_provider" $provider.DisplayName}}
 					</a>
 				{{end}}

templates/user/settings/security/accountlinks.tmpl

@@ -8,7 +8,7 @@
 					{{range $key := .OrderedOAuth2Names}}
 						{{$provider := index $.OAuth2Providers $key}}
 						<a class="item" href="{{AppSubUrl}}/user/oauth2/{{$key}}">
-							<img class="gt-mr-3" width="20" height="20" src="{{$provider.IconURL}}" alt="{{$provider.DisplayName}}">
+							{{$provider.IconHTML}}
 							{{$provider.DisplayName}}
 						</a>
 					{{end}}

web_src/svg/gitea-azureadv2.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 18 18" class="svg gitea-azuread" width="16" height="16" aria-hidden="true"><defs><linearGradient id="gitea-azuread__a" x1="13.25" x2="8.62" y1="13.02" y2="4.25" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#1988d9"/><stop offset=".9" stop-color="#54aef0"/></linearGradient><linearGradient id="gitea-azuread__b" x1="11.26" x2="14.46" y1="10.47" y2="15.99" gradientUnits="userSpaceOnUse"><stop offset=".1" stop-color="#54aef0"/><stop offset=".29" stop-color="#4fabee"/><stop offset=".51" stop-color="#41a2e9"/><stop offset=".74" stop-color="#2a93e0"/><stop offset=".88" stop-color="#1988d9"/></linearGradient></defs><path fill="#50e6ff" d="m1.01 10.19 7.92 5.14 8.06-5.16L18 11.35l-9.07 5.84L0 11.35l1.01-1.16z"/><path fill="#fff" d="M1.61 9.53 8.93.81l7.47 8.73-7.47 4.72-7.32-4.73z"/><path fill="#50e6ff" d="M8.93.81v13.45L1.61 9.53 8.93.81z"/><path fill="url(#gitea-azuread__a)" d="M8.93.81v13.45l7.47-4.72L8.93.81z"/><path fill="#53b1e0" d="m8.93 7.76 7.47 1.78-7.47 4.72v-6.5z"/><path fill="#9cebff" d="M8.93 14.26 1.61 9.53l7.32-1.77v6.5z"/><path fill="url(#gitea-azuread__b)" d="M8.93 17.19 18 11.35l-1.01-1.18-8.06 5.16v1.86z"/></svg>