Display SVG files as images instead of text

custom/conf/app.example.ini

@@ -244,6 +244,10 @@ TIMEOUT_STEP = 10s
 ; If the browser client supports EventSource and SharedWorker, a SharedWorker will be used in preference to polling notification. Set to -1 to disable the EventSource
 EVENT_SOURCE_UPDATE_TIME = 10s
 
+[ui.svg]
+; Whether to render SVG files as images.  If SVG rendering is disabled, SVG files are displayed as text and cannot be embedded in markdown files as images.
+ENABLE_RENDER = true
+
 [markdown]
 ; Render soft line breaks as hard line breaks, which means a single newline character between
 ; paragraphs will cause a line break and adding trailing whitespace to paragraphs is not

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -194,6 +194,10 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
 - `TIMEOUT_STEP`: **10s**.
 - `EVENT_SOURCE_UPDATE_TIME`: **10s**: This setting determines how often the database is queried to update notification counts. If the browser client supports `EventSource` and `SharedWorker`, a `SharedWorker` will be used in preference to polling notification endpoint. Set to **-1** to disable the `EventSource`.
 
+### UI - SVG Images (`ui.svg`)
+
+- `ENABLE_RENDER`: **true**: Whether to render SVG files as images.  If SVG rendering is disabled, SVG files are displayed as text and cannot be embedded in markdown files as images.
+
 ## Markdown (`markdown`)
 
 - `ENABLE_HARD_LINE_BREAK_IN_COMMENTS`: **true**: Render soft line breaks as hard line breaks in comments, which

integrations/download_test.go

@@ -23,6 +23,20 @@ func TestDownloadByID(t *testing.T) {
 	assert.Equal(t, "# repo1\n\nDescription for repo1", resp.Body.String())
 }
 
+func TestDownloadByIDForSVGUsesSecureHeaders(t *testing.T) {
+	defer prepareTestEnv(t)()
+
+	session := loginUser(t, "user2")
+
+	// Request raw blob
+	req := NewRequest(t, "GET", "/user2/repo2/raw/blob/6395b68e1feebb1e4c657b4f9f6ba2676a283c0b")
+	resp := session.MakeRequest(t, req, http.StatusOK)
+
+	assert.Equal(t, "default-src 'none'; style-src 'unsafe-inline'; sandbox", resp.HeaderMap.Get("Content-Security-Policy"))
+	assert.Equal(t, "image/svg+xml", resp.HeaderMap.Get("Content-Type"))
+	assert.Equal(t, "nosniff", resp.HeaderMap.Get("X-Content-Type-Options"))
+}
+
 func TestDownloadByIDMedia(t *testing.T) {
 	defer prepareTestEnv(t)()
 
@@ -34,3 +48,17 @@ func TestDownloadByIDMedia(t *testing.T) {
 
 	assert.Equal(t, "# repo1\n\nDescription for repo1", resp.Body.String())
 }
+
+func TestDownloadByIDMediaForSVGUsesSecureHeaders(t *testing.T) {
+	defer prepareTestEnv(t)()
+
+	session := loginUser(t, "user2")
+
+	// Request raw blob
+	req := NewRequest(t, "GET", "/user2/repo2/media/blob/6395b68e1feebb1e4c657b4f9f6ba2676a283c0b")
+	resp := session.MakeRequest(t, req, http.StatusOK)
+
+	assert.Equal(t, "default-src 'none'; style-src 'unsafe-inline'; sandbox", resp.HeaderMap.Get("Content-Security-Policy"))
+	assert.Equal(t, "image/svg+xml", resp.HeaderMap.Get("Content-Type"))
+	assert.Equal(t, "nosniff", resp.HeaderMap.Get("X-Content-Type-Options"))
+}

integrations/gitea-repositories-meta/user2/repo2.git/HEAD

@@ -0,0 +1 @@
+ref: refs/heads/master

integrations/gitea-repositories-meta/user2/repo2.git/config

@@ -0,0 +1,4 @@
+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = true

integrations/gitea-repositories-meta/user2/repo2.git/description

@@ -0,0 +1 @@
+Unnamed repository; edit this file 'description' to name the repository.

integrations/gitea-repositories-meta/user2/repo2.git/hooks/applypatch-msg.sample

@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# An example hook script to check the commit log message taken by
+# applypatch from an e-mail message.
+#
+# The hook should exit with non-zero status after issuing an
+# appropriate message if it wants to stop the commit.  The hook is
+# allowed to edit the commit message file.
+#
+# To enable this hook, rename this file to "applypatch-msg".
+
+. git-sh-setup
+commitmsg="$(git rev-parse --git-path hooks/commit-msg)"
+test -x "$commitmsg" && exec "$commitmsg" ${1+"$@"}
+:

integrations/gitea-repositories-meta/user2/repo2.git/hooks/commit-msg.sample

@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# An example hook script to check the commit log message.
+# Called by "git commit" with one argument, the name of the file
+# that has the commit message.  The hook should exit with non-zero
+# status after issuing an appropriate message if it wants to stop the
+# commit.  The hook is allowed to edit the commit message file.
+#
+# To enable this hook, rename this file to "commit-msg".
+
+# Uncomment the below to add a Signed-off-by line to the message.
+# Doing this in a hook is a bad idea in general, but the prepare-commit-msg
+# hook is more suited to it.
+#
+# SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
+# grep -qs "^$SOB" "$1" || echo "$SOB" >> "$1"
+
+# This example catches duplicate Signed-off-by lines.
+
+test "" = "$(grep '^Signed-off-by: ' "$1" |
+	 sort | uniq -c | sed -e '/^[ 	]*1[ 	]/d')" || {
+	echo >&2 Duplicate Signed-off-by lines.
+	exit 1
+}

integrations/gitea-repositories-meta/user2/repo2.git/hooks/post-update.sample

@@ -0,0 +1,8 @@
+#!/bin/sh
+#
+# An example hook script to prepare a packed repository for use over
+# dumb transports.
+#
+# To enable this hook, rename this file to "post-update".
+
+exec git update-server-info

integrations/gitea-repositories-meta/user2/repo2.git/hooks/pre-applypatch.sample

@@ -0,0 +1,14 @@
+#!/bin/sh
+#
+# An example hook script to verify what is about to be committed
+# by applypatch from an e-mail message.
+#
+# The hook should exit with non-zero status after issuing an
+# appropriate message if it wants to stop the commit.
+#
+# To enable this hook, rename this file to "pre-applypatch".
+
+. git-sh-setup
+precommit="$(git rev-parse --git-path hooks/pre-commit)"
+test -x "$precommit" && exec "$precommit" ${1+"$@"}
+:

integrations/gitea-repositories-meta/user2/repo2.git/hooks/pre-commit.sample

@@ -0,0 +1,49 @@
+#!/bin/sh
+#
+# An example hook script to verify what is about to be committed.
+# Called by "git commit" with no arguments.  The hook should
+# exit with non-zero status after issuing an appropriate message if
+# it wants to stop the commit.
+#
+# To enable this hook, rename this file to "pre-commit".
+
+if git rev-parse --verify HEAD >/dev/null 2>&1
+then
+	against=HEAD
+else
+	# Initial commit: diff against an empty tree object
+	against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
+fi
+
+# If you want to allow non-ASCII filenames set this variable to true.
+allownonascii=$(git config --bool hooks.allownonascii)
+
+# Redirect output to stderr.
+exec 1>&2
+
+# Cross platform projects tend to avoid non-ASCII filenames; prevent
+# them from being added to the repository. We exploit the fact that the
+# printable range starts at the space character and ends with tilde.
+if [ "$allownonascii" != "true" ] &&
+	# Note that the use of brackets around a tr range is ok here, (it's
+	# even required, for portability to Solaris 10's /usr/bin/tr), since
+	# the square bracket bytes happen to fall in the designated range.
+	test $(git diff --cached --name-only --diff-filter=A -z $against |
+	  LC_ALL=C tr -d '[ -~]\0' | wc -c) != 0
+then
+	cat <<\EOF
+Error: Attempt to add a non-ASCII file name.
+
+This can cause problems if you want to work with people on other platforms.
+
+To be portable it is advisable to rename the file.
+
+If you know what you are doing you can disable this check using:
+
+  git config hooks.allownonascii true
+EOF
+	exit 1
+fi
+
+# If there are whitespace errors, print the offending file names and fail.
+exec git diff-index --check --cached $against --

integrations/gitea-repositories-meta/user2/repo2.git/hooks/pre-push.sample

@@ -0,0 +1,53 @@
+#!/bin/sh
+
+# An example hook script to verify what is about to be pushed.  Called by "git
+# push" after it has checked the remote status, but before anything has been
+# pushed.  If this script exits with a non-zero status nothing will be pushed.
+#
+# This hook is called with the following parameters:
+#
+# $1 -- Name of the remote to which the push is being done
+# $2 -- URL to which the push is being done
+#
+# If pushing without using a named remote those arguments will be equal.
+#
+# Information about the commits which are being pushed is supplied as lines to
+# the standard input in the form:
+#
+#   <local ref> <local sha1> <remote ref> <remote sha1>
+#
+# This sample shows how to prevent push of commits where the log message starts
+# with "WIP" (work in progress).
+
+remote="$1"
+url="$2"
+
+z40=0000000000000000000000000000000000000000
+
+while read local_ref local_sha remote_ref remote_sha
+do
+	if [ "$local_sha" = $z40 ]
+	then
+		# Handle delete
+		:
+	else
+		if [ "$remote_sha" = $z40 ]
+		then
+			# New branch, examine all commits
+			range="$local_sha"
+		else
+			# Update to existing branch, examine new commits
+			range="$remote_sha..$local_sha"
+		fi
+
+		# Check for WIP commit
+		commit=`git rev-list -n 1 --grep '^WIP' "$range"`
+		if [ -n "$commit" ]
+		then
+			echo >&2 "Found WIP commit in $local_ref, not pushing"
+			exit 1
+		fi
+	fi
+done
+
+exit 0

integrations/gitea-repositories-meta/user2/repo2.git/hooks/pre-rebase.sample

@@ -0,0 +1,169 @@
+#!/bin/sh
+#
+# Copyright (c) 2006, 2008 Junio C Hamano
+#
+# The "pre-rebase" hook is run just before "git rebase" starts doing
+# its job, and can prevent the command from running by exiting with
+# non-zero status.
+#
+# The hook is called with the following parameters:
+#
+# $1 -- the upstream the series was forked from.
+# $2 -- the branch being rebased (or empty when rebasing the current branch).
+#
+# This sample shows how to prevent topic branches that are already
+# merged to 'next' branch from getting rebased, because allowing it
+# would result in rebasing already published history.
+
+publish=next
+basebranch="$1"
+if test "$#" = 2
+then
+	topic="refs/heads/$2"
+else
+	topic=`git symbolic-ref HEAD` ||
+	exit 0 ;# we do not interrupt rebasing detached HEAD
+fi
+
+case "$topic" in
+refs/heads/??/*)
+	;;
+*)
+	exit 0 ;# we do not interrupt others.
+	;;
+esac
+
+# Now we are dealing with a topic branch being rebased
+# on top of master.  Is it OK to rebase it?
+
+# Does the topic really exist?
+git show-ref -q "$topic" || {
+	echo >&2 "No such branch $topic"
+	exit 1
+}
+
+# Is topic fully merged to master?
+not_in_master=`git rev-list --pretty=oneline ^master "$topic"`
+if test -z "$not_in_master"
+then
+	echo >&2 "$topic is fully merged to master; better remove it."
+	exit 1 ;# we could allow it, but there is no point.
+fi
+
+# Is topic ever merged to next?  If so you should not be rebasing it.
+only_next_1=`git rev-list ^master "^$topic" ${publish} | sort`
+only_next_2=`git rev-list ^master           ${publish} | sort`
+if test "$only_next_1" = "$only_next_2"
+then
+	not_in_topic=`git rev-list "^$topic" master`
+	if test -z "$not_in_topic"
+	then
+		echo >&2 "$topic is already up-to-date with master"
+		exit 1 ;# we could allow it, but there is no point.
+	else
+		exit 0
+	fi
+else
+	not_in_next=`git rev-list --pretty=oneline ^${publish} "$topic"`
+	/usr/bin/perl -e '
+		my $topic = $ARGV[0];
+		my $msg = "* $topic has commits already merged to public branch:\n";
+		my (%not_in_next) = map {
+			/^([0-9a-f]+) /;
+			($1 => 1);
+		} split(/\n/, $ARGV[1]);
+		for my $elem (map {
+				/^([0-9a-f]+) (.*)$/;
+				[$1 => $2];
+			} split(/\n/, $ARGV[2])) {
+			if (!exists $not_in_next{$elem->[0]}) {
+				if ($msg) {
+					print STDERR $msg;
+					undef $msg;
+				}
+				print STDERR " $elem->[1]\n";
+			}
+		}
+	' "$topic" "$not_in_next" "$not_in_master"
+	exit 1
+fi
+
+<<\DOC_END
+
+This sample hook safeguards topic branches that have been
+published from being rewound.
+
+The workflow assumed here is:
+
+ * Once a topic branch forks from "master", "master" is never
+   merged into it again (either directly or indirectly).
+
+ * Once a topic branch is fully cooked and merged into "master",
+   it is deleted.  If you need to build on top of it to correct
+   earlier mistakes, a new topic branch is created by forking at
+   the tip of the "master".  This is not strictly necessary, but
+   it makes it easier to keep your history simple.
+
+ * Whenever you need to test or publish your changes to topic
+   branches, merge them into "next" branch.
+
+The script, being an example, hardcodes the publish branch name
+to be "next", but it is trivial to make it configurable via
+$GIT_DIR/config mechanism.
+
+With this workflow, you would want to know:
+
+(1) ... if a topic branch has ever been merged to "next".  Young
+    topic branches can have stupid mistakes you would rather
+    clean up before publishing, and things that have not been
+    merged into other branches can be easily rebased without
+    affecting other people.  But once it is published, you would
+    not want to rewind it.
+
+(2) ... if a topic branch has been fully merged to "master".
+    Then you can delete it.  More importantly, you should not
+    build on top of it -- other people may already want to
+    change things related to the topic as patches against your
+    "master", so if you need further changes, it is better to
+    fork the topic (perhaps with the same name) afresh from the
+    tip of "master".
+
+Let's look at this example:
+
+		   o---o---o---o---o---o---o---o---o---o "next"
+		  /       /           /           /
+		 /   a---a---b A     /           /
+		/   /               /           /
+	       /   /   c---c---c---c B         /
+	      /   /   /             \         /
+	     /   /   /   b---b C     \       /
+	    /   /   /   /             \     /
+    ---o---o---o---o---o---o---o---o---o---o---o "master"
+
+
+A, B and C are topic branches.
+
+ * A has one fix since it was merged up to "next".
+
+ * B has finished.  It has been fully merged up to "master" and "next",
+   and is ready to be deleted.
+
+ * C has not merged to "next" at all.
+
+We would want to allow C to be rebased, refuse A, and encourage
+B to be deleted.
+
+To compute (1):
+
+	git rev-list ^master ^topic next
+	git rev-list ^master        next
+
+	if these match, topic has not merged in next at all.
+
+To compute (2):
+
+	git rev-list master..topic
+
+	if this is empty, it is fully merged to "master".
+
+DOC_END

integrations/gitea-repositories-meta/user2/repo2.git/hooks/prepare-commit-msg.sample

@@ -0,0 +1,36 @@
+#!/bin/sh
+#
+# An example hook script to prepare the commit log message.
+# Called by "git commit" with the name of the file that has the
+# commit message, followed by the description of the commit
+# message's source.  The hook's purpose is to edit the commit
+# message file.  If the hook fails with a non-zero status,
+# the commit is aborted.
+#
+# To enable this hook, rename this file to "prepare-commit-msg".
+
+# This hook includes three examples.  The first comments out the
+# "Conflicts:" part of a merge commit.
+#
+# The second includes the output of "git diff --name-status -r"
+# into the message, just before the "git status" output.  It is
+# commented because it doesn't cope with --amend or with squashed
+# commits.
+#
+# The third example adds a Signed-off-by line to the message, that can
+# still be edited.  This is rarely a good idea.
+
+case "$2,$3" in
+  merge,)
+    /usr/bin/perl -i.bak -ne 's/^/# /, s/^# #/#/ if /^Conflicts/ .. /#/; print' "$1" ;;
+
+# ,|template,)
+#   /usr/bin/perl -i.bak -pe '
+#      print "\n" . `git diff --cached --name-status -r`
+#	 if /^#/ && $first++ == 0' "$1" ;;
+
+  *) ;;
+esac
+
+# SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
+# grep -qs "^$SOB" "$1" || echo "$SOB" >> "$1"

integrations/gitea-repositories-meta/user2/repo2.git/hooks/update.sample

@@ -0,0 +1,128 @@
+#!/bin/sh
+#
+# An example hook script to block unannotated tags from entering.
+# Called by "git receive-pack" with arguments: refname sha1-old sha1-new
+#
+# To enable this hook, rename this file to "update".
+#
+# Config
+# ------
+# hooks.allowunannotated
+#   This boolean sets whether unannotated tags will be allowed into the
+#   repository.  By default they won't be.
+# hooks.allowdeletetag
+#   This boolean sets whether deleting tags will be allowed in the
+#   repository.  By default they won't be.
+# hooks.allowmodifytag
+#   This boolean sets whether a tag may be modified after creation. By default
+#   it won't be.
+# hooks.allowdeletebranch
+#   This boolean sets whether deleting branches will be allowed in the
+#   repository.  By default they won't be.
+# hooks.denycreatebranch
+#   This boolean sets whether remotely creating branches will be denied
+#   in the repository.  By default this is allowed.
+#
+
+# --- Command line
+refname="$1"
+oldrev="$2"
+newrev="$3"
+
+# --- Safety check
+if [ -z "$GIT_DIR" ]; then
+	echo "Don't run this script from the command line." >&2
+	echo " (if you want, you could supply GIT_DIR then run" >&2
+	echo "  $0 <ref> <oldrev> <newrev>)" >&2
+	exit 1
+fi
+
+if [ -z "$refname" -o -z "$oldrev" -o -z "$newrev" ]; then
+	echo "usage: $0 <ref> <oldrev> <newrev>" >&2
+	exit 1
+fi
+
+# --- Config
+allowunannotated=$(git config --bool hooks.allowunannotated)
+allowdeletebranch=$(git config --bool hooks.allowdeletebranch)
+denycreatebranch=$(git config --bool hooks.denycreatebranch)
+allowdeletetag=$(git config --bool hooks.allowdeletetag)
+allowmodifytag=$(git config --bool hooks.allowmodifytag)
+
+# check for no description
+projectdesc=$(sed -e '1q' "$GIT_DIR/description")
+case "$projectdesc" in
+"Unnamed repository"* | "")
+	echo "*** Project description file hasn't been set" >&2
+	exit 1
+	;;
+esac
+
+# --- Check types
+# if $newrev is 0000...0000, it's a commit to delete a ref.
+zero="0000000000000000000000000000000000000000"
+if [ "$newrev" = "$zero" ]; then
+	newrev_type=delete
+else
+	newrev_type=$(git cat-file -t $newrev)
+fi
+
+case "$refname","$newrev_type" in
+	refs/tags/*,commit)
+		# un-annotated tag
+		short_refname=${refname##refs/tags/}
+		if [ "$allowunannotated" != "true" ]; then
+			echo "*** The un-annotated tag, $short_refname, is not allowed in this repository" >&2
+			echo "*** Use 'git tag [ -a | -s ]' for tags you want to propagate." >&2
+			exit 1
+		fi
+		;;
+	refs/tags/*,delete)
+		# delete tag
+		if [ "$allowdeletetag" != "true" ]; then
+			echo "*** Deleting a tag is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	refs/tags/*,tag)
+		# annotated tag
+		if [ "$allowmodifytag" != "true" ] && git rev-parse $refname > /dev/null 2>&1
+		then
+			echo "*** Tag '$refname' already exists." >&2
+			echo "*** Modifying a tag is not allowed in this repository." >&2
+			exit 1
+		fi
+		;;
+	refs/heads/*,commit)
+		# branch
+		if [ "$oldrev" = "$zero" -a "$denycreatebranch" = "true" ]; then
+			echo "*** Creating a branch is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	refs/heads/*,delete)
+		# delete branch
+		if [ "$allowdeletebranch" != "true" ]; then
+			echo "*** Deleting a branch is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	refs/remotes/*,commit)
+		# tracking branch
+		;;
+	refs/remotes/*,delete)
+		# delete tracking branch
+		if [ "$allowdeletebranch" != "true" ]; then
+			echo "*** Deleting a tracking branch is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	*)
+		# Anything else (is there anything else?)
+		echo "*** Update hook: unknown type of update to ref $refname of type $newrev_type" >&2
+		exit 1
+		;;
+esac
+
+# --- Finished
+exit 0

integrations/gitea-repositories-meta/user2/repo2.git/info/exclude

@@ -0,0 +1,6 @@
+# git ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~

integrations/gitea-repositories-meta/user2/repo2.git/info/refs

@@ -0,0 +1 @@
+205ac761f3326a7ebe416e8673760016450b5cec	refs/heads/master

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integrations/gitea-repositories-meta/user2/repo2.git/objects/1c/887eaa8d81fa86da7695d8f635cf17813eb422

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@@ -0,0 +1,2 @@
+x
���m�0���)n���t2�S����`ņ���e�,VY�/H�#�[)��E��@N�q��툎�r2�)D��0�j�C���L��aC��&�4B�v]$E����Iӑe����P�r�I�s�e�z�˳~_
+���[y��v��W��V=헛�˘�H	vZ~s�@݉%����?T�ZH

integrations/gitea-repositories-meta/user2/repo2.git/objects/info/packs

@@ -0,0 +1,2 @@
+P pack-a2f7ad943b3d857eb3ebdb4b35eeef38f63cf5d2.pack
+

integrations/gitea-repositories-meta/user2/repo2.git/packed-refs

@@ -0,0 +1,2 @@
+# pack-refs with: peeled fully-peeled sorted 
+205ac761f3326a7ebe416e8673760016450b5cec refs/heads/master

integrations/gitea-repositories-meta/user2/repo2.git/refs/heads/master

@@ -0,0 +1 @@
+205ac761f3326a7ebe416e8673760016450b5cec

integrations/view_test.go

@@ -0,0 +1,26 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package integrations
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRenderFileSVGIsInImgTag(t *testing.T) {
+	defer prepareTestEnv(t)()
+
+	session := loginUser(t, "user2")
+
+	req := NewRequest(t, "GET", "/user2/repo2/src/branch/master/line.svg")
+	resp := session.MakeRequest(t, req, http.StatusOK)
+
+	doc := NewHTMLParser(t, resp.Body)
+	src, exists := doc.doc.Find(".file-view img").Attr("src")
+	assert.True(t, exists, "The SVG image should be in an <img> tag so that scripts in the SVG are not run")
+	assert.Equal(t, "/user2/repo2/raw/branch/master/line.svg", src)
+}

modules/base/tool.go

@@ -15,6 +15,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"regexp"
 	"runtime"
 	"strconv"
 	"strings"
@@ -28,6 +29,15 @@ import (
 	"github.com/dustin/go-humanize"
 )
 
+// Use at most this many bytes to determine Content Type.
+const sniffLen = 512
+
+// SVGMimeType MIME type of SVG images.
+const SVGMimeType = "image/svg+xml"
+
+var svgTagRegex = regexp.MustCompile(`(?s)\A\s*(?:<!--.*?-->\s*)*<svg\b`)
+var svgTagInXMLRegex = regexp.MustCompile(`(?s)\A<\?xml\b.*?\?>\s*(?:<!--.*?-->\s*)*<svg\b`)
+
 // EncodeMD5 encodes string to md5 hex value.
 func EncodeMD5(str string) string {
 	m := md5.New()
@@ -265,32 +275,61 @@ func IsLetter(ch rune) bool {
 	return 'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z' || ch == '_' || ch >= 0x80 && unicode.IsLetter(ch)
 }
 
+// DetectContentType extends http.DetectContentType with more content types.
+func DetectContentType(data []byte) string {
+	ct := http.DetectContentType(data)
+
+	if len(data) > sniffLen {
+		data = data[:sniffLen]
+	}
+
+	if setting.UI.SVG.Enabled &&
+		((strings.Contains(ct, "text/plain") || strings.Contains(ct, "text/html")) && svgTagRegex.Match(data) ||
+			strings.Contains(ct, "text/xml") && svgTagInXMLRegex.Match(data)) {
+
+		// SVG is unsupported.  https://github.com/golang/go/issues/15888
+		return SVGMimeType
+	}
+	return ct
+}
+
+// IsRepresentableAsText returns true if file content can be represented as
+// plain text or is empty.
+func IsRepresentableAsText(data []byte) bool {
+	return IsTextFile(data) || IsSVGImageFile(data)
+}
+
 // IsTextFile returns true if file content format is plain text or empty.
 func IsTextFile(data []byte) bool {
 	if len(data) == 0 {
 		return true
 	}
-	return strings.Contains(http.DetectContentType(data), "text/")
+	return strings.Contains(DetectContentType(data), "text/")
 }
 
 // IsImageFile detects if data is an image format
 func IsImageFile(data []byte) bool {
-	return strings.Contains(http.DetectContentType(data), "image/")
+	return strings.Contains(DetectContentType(data), "image/")
+}
+
+// IsSVGImageFile detects if data is an SVG image format
+func IsSVGImageFile(data []byte) bool {
+	return strings.Contains(DetectContentType(data), SVGMimeType)
 }
 
 // IsPDFFile detects if data is a pdf format
 func IsPDFFile(data []byte) bool {
-	return strings.Contains(http.DetectContentType(data), "application/pdf")
+	return strings.Contains(DetectContentType(data), "application/pdf")
 }
 
 // IsVideoFile detects if data is an video format
 func IsVideoFile(data []byte) bool {
-	return strings.Contains(http.DetectContentType(data), "video/")
+	return strings.Contains(DetectContentType(data), "video/")
 }
 
 // IsAudioFile detects if data is an video format
 func IsAudioFile(data []byte) bool {
-	return strings.Contains(http.DetectContentType(data), "audio/")
+	return strings.Contains(DetectContentType(data), "audio/")
 }
 
 // EntryIcon returns the octicon class for displaying files/directories

modules/base/tool_test.go

@@ -183,11 +183,63 @@ func TestIsLetter(t *testing.T) {
 	assert.False(t, IsLetter('$'))
 }
 
+func TestDetectContentTypeLongerThanSniffLen(t *testing.T) {
+	// Pre-condition: Shorter than sniffLen detects SVG.
+	assert.Equal(t, "image/svg+xml", DetectContentType([]byte(`<!-- Comment --><svg></svg>`)))
+	// Longer than sniffLen detects something else.
+	assert.Equal(t, "text/plain; charset=utf-8", DetectContentType([]byte(`<!--
+Comment Comment Comment Comment Comment Comment Comment Comment Comment Comment
+Comment Comment Comment Comment Comment Comment Comment Comment Comment Comment
+Comment Comment Comment Comment Comment Comment Comment Comment Comment Comment
+Comment Comment Comment Comment Comment Comment Comment Comment Comment Comment
+Comment Comment Comment Comment Comment Comment Comment Comment Comment Comment
+Comment Comment Comment Comment Comment Comment Comment Comment Comment Comment
+Comment Comment Comment --><svg></svg>`)))
+}
+
 func TestIsTextFile(t *testing.T) {
 	assert.True(t, IsTextFile([]byte{}))
 	assert.True(t, IsTextFile([]byte("lorem ipsum")))
 }
 
+func TestIsSVGImageFile(t *testing.T) {
+	assert.True(t, IsSVGImageFile([]byte("<svg></svg>")))
+	assert.True(t, IsSVGImageFile([]byte("    <svg></svg>")))
+	assert.True(t, IsSVGImageFile([]byte(`<svg width="100"></svg>`)))
+	assert.True(t, IsSVGImageFile([]byte("<svg/>")))
+	assert.True(t, IsSVGImageFile([]byte(`<?xml version="1.0" encoding="UTF-8"?><svg></svg>`)))
+	assert.True(t, IsSVGImageFile([]byte(`<!-- Comment -->
+	<svg></svg>`)))
+	assert.True(t, IsSVGImageFile([]byte(`<!-- Multiple -->
+	<!-- Comments -->
+	<svg></svg>`)))
+	assert.True(t, IsSVGImageFile([]byte(`<!-- Multiline
+	Comment -->
+	<svg></svg>`)))
+	assert.True(t, IsSVGImageFile([]byte(`<?xml version="1.0" encoding="UTF-8"?>
+	<!-- Comment -->
+	<svg></svg>`)))
+	assert.True(t, IsSVGImageFile([]byte(`<?xml version="1.0" encoding="UTF-8"?>
+	<!-- Multiple -->
+	<!-- Comments -->
+	<svg></svg>`)))
+	assert.True(t, IsSVGImageFile([]byte(`<?xml version="1.0" encoding="UTF-8"?>
+	<!-- Multline
+	Comment -->
+	<svg></svg>`)))
+	assert.False(t, IsSVGImageFile([]byte{}))
+	assert.False(t, IsSVGImageFile([]byte("svg")))
+	assert.False(t, IsSVGImageFile([]byte("<svgfoo></svgfoo>")))
+	assert.False(t, IsSVGImageFile([]byte("text<svg></svg>")))
+	assert.False(t, IsSVGImageFile([]byte("<html><body><svg></svg></body></html>")))
+	assert.False(t, IsSVGImageFile([]byte(`<script>"<svg></svg>"</script>`)))
+	assert.False(t, IsSVGImageFile([]byte(`<!-- <svg></svg> inside comment -->
+	<foo></foo>`)))
+	assert.False(t, IsSVGImageFile([]byte(`<?xml version="1.0" encoding="UTF-8"?>
+	<!-- <svg></svg> inside comment -->
+	<foo></foo>`)))
+}
+
 func TestFormatNumberSI(t *testing.T) {
 	assert.Equal(t, "125", FormatNumberSI(int(125)))
 	assert.Equal(t, "1.3k", FormatNumberSI(int64(1317)))

modules/setting/setting.go

@@ -190,6 +190,10 @@ var (
 			EventSourceUpdateTime time.Duration
 		} `ini:"ui.notification"`
 
+		SVG struct {
+			Enabled bool `ini:"ENABLE_RENDER"`
+		} `ini:"ui.svg"`
+
 		Admin struct {
 			UserPagingNum   int
 			RepoPagingNum   int
@@ -230,6 +234,11 @@ var (
 			MaxTimeout:            60 * time.Second,
 			EventSourceUpdateTime: 10 * time.Second,
 		},
+		SVG: struct {
+			Enabled bool `ini:"ENABLE_RENDER"`
+		}{
+			Enabled: true,
+		},
 		Admin: struct {
 			UserPagingNum   int
 			RepoPagingNum   int

options/locale/locale_en-US.ini

@@ -823,6 +823,8 @@ tag = Tag
 released_this = released this
 file_raw = Raw
 file_history = History
+file_view_source = View Source
+file_view_rendered = View Rendered
 file_view_raw = View Raw
 file_permalink = Permalink
 file_too_large = The file is too large to be shown.

routers/repo/download.go

@@ -46,6 +46,11 @@ func ServeData(ctx *context.Context, name string, reader io.Reader) error {
 	} else if base.IsImageFile(buf) || base.IsPDFFile(buf) {
 		ctx.Resp.Header().Set("Content-Disposition", fmt.Sprintf(`inline; filename="%s"`, name))
 		ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
+		if base.IsSVGImageFile(buf) {
+			ctx.Resp.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'; sandbox")
+			ctx.Resp.Header().Set("X-Content-Type-Options", "nosniff")
+			ctx.Resp.Header().Set("Content-Type", base.SVGMimeType)
+		}
 	} else {
 		ctx.Resp.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, name))
 		ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")

routers/repo/editor.go

@@ -114,9 +114,9 @@ func editFile(ctx *context.Context, isNewFile bool) {
 		n, _ := dataRc.Read(buf)
 		buf = buf[:n]
 
-		// Only text file are editable online.
-		if !base.IsTextFile(buf) {
-			ctx.NotFound("base.IsTextFile", nil)
+		// Only some file types are editable online as text.
+		if !base.IsRepresentableAsText(buf) {
+			ctx.NotFound("base.IsRepresentableAsText", nil)
 			return
 		}
 

routers/repo/lfs.go

@@ -279,14 +279,19 @@ func LFSFileGet(ctx *context.Context) {
 	}
 	buf = buf[:n]
 
-	isTextFile := base.IsTextFile(buf)
-	ctx.Data["IsTextFile"] = isTextFile
+	ctx.Data["IsTextFile"] = base.IsTextFile(buf)
+	isRepresentableAsText := base.IsRepresentableAsText(buf)
 
 	fileSize := meta.Size
 	ctx.Data["FileSize"] = meta.Size
 	ctx.Data["RawFileLink"] = fmt.Sprintf("%s%s.git/info/lfs/objects/%s/%s", setting.AppURL, ctx.Repo.Repository.FullName(), meta.Oid, "direct")
 	switch {
-	case isTextFile:
+	case isRepresentableAsText:
+		// This will be true for SVGs.
+		if base.IsImageFile(buf) {
+			ctx.Data["IsImageFile"] = true
+		}
+
 		if fileSize >= setting.UI.MaxDisplayFileSize {
 			ctx.Data["IsFileTooLarge"] = true
 			break

routers/repo/view.go

@@ -396,6 +396,20 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
 	isLFSFile := false
 	ctx.Data["IsTextFile"] = isTextFile
 
+	isDisplayingSource := ctx.Query("display") == "source"
+	isDisplayingRendered := !isDisplayingSource
+	isRepresentableAsText := base.IsRepresentableAsText(buf)
+	ctx.Data["IsRepresentableAsText"] = isRepresentableAsText
+	if !isRepresentableAsText {
+		// If we can't show plain text, always try to render.
+		isDisplayingSource = false
+		isDisplayingRendered = true
+	}
+	ctx.Data["IsDisplayingSource"] = isDisplayingSource
+	ctx.Data["IsDisplayingRendered"] = isDisplayingRendered
+
+	ctx.Data["IsTextSource"] = isTextFile || isDisplayingSource
+
 	//Check for LFS meta file
 	if isTextFile && setting.LFS.StartServer {
 		meta := lfs.IsPointerFile(&buf)
@@ -451,12 +465,18 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
 	// Assume file is not editable first.
 	if isLFSFile {
 		ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.cannot_edit_lfs_files")
-	} else if !isTextFile {
+	} else if !isRepresentableAsText {
 		ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.cannot_edit_non_text_files")
 	}
 
 	switch {
-	case isTextFile:
+	case isRepresentableAsText:
+		// This will be true for SVGs.
+		if base.IsImageFile(buf) {
+			ctx.Data["IsImageFile"] = true
+			ctx.Data["HasSourceRenderedToggle"] = true
+		}
+
 		if fileSize >= setting.UI.MaxDisplayFileSize {
 			ctx.Data["IsFileTooLarge"] = true
 			break

templates/repo/view_file.tmpl

@@ -32,12 +32,18 @@
 		</div>
 		{{if not .ReadmeInList}}
 		<div class="file-header-right file-actions df ac">
+			{{if .HasSourceRenderedToggle}}
+				<div class="ui compact icon buttons">
+					<a href="{{$.Link}}?display=source" class="ui tiny basic button poping up {{if .IsDisplayingSource}}active{{end}}" data-content="{{.i18n.Tr "repo.file_view_source"}}" data-position="bottom center" data-variation="tiny inverted">{{svg "octicon-code"}}</a>
+					<a href="{{$.Link}}" class="ui tiny basic button poping up {{if .IsDisplayingRendered}}active{{end}}" data-content="{{.i18n.Tr "repo.file_view_rendered"}}" data-position="bottom center" data-variation="tiny inverted">{{svg "octicon-file"}}</a>
+				</div>
+			{{end}}
 			<div class="ui buttons mr-2">
 				<a class="ui mini basic button" href="{{EscapePound $.RawFileLink}}">{{.i18n.Tr "repo.file_raw"}}</a>
 				{{if not .IsViewCommit}}
 					<a class="ui mini basic button" href="{{.RepoLink}}/src/commit/{{.CommitID}}/{{EscapePound .TreePath}}">{{.i18n.Tr "repo.file_permalink"}}</a>
 				{{end}}
-				{{if .IsTextFile}}
+				{{if .IsRepresentableAsText}}
 					<a class="ui mini basic button" href="{{.RepoLink}}/blame/{{EscapePound .BranchNameSubURL}}/{{EscapePound .TreePath}}">{{.i18n.Tr "repo.blame"}}</a>
 				{{end}}
 				<a class="ui mini basic button" href="{{.RepoLink}}/commits/{{EscapePound .BranchNameSubURL}}/{{EscapePound .TreePath}}">{{.i18n.Tr "repo.file_history"}}</a>
@@ -58,12 +64,12 @@
 		{{end}}
 	</h4>
 	<div class="ui attached table unstackable segment">
-		<div class="file-view {{if .IsMarkup}}{{.MarkupType}} markdown{{else if .IsRenderedHTML}}plain-text{{else if .IsTextFile}}code-view{{end}}">
+		<div class="file-view {{if .IsMarkup}}{{.MarkupType}} markdown{{else if .IsRenderedHTML}}plain-text{{else if .IsTextSource}}code-view{{end}}">
 			{{if .IsMarkup}}
 				{{if .FileContent}}{{.FileContent | Safe}}{{end}}
 			{{else if .IsRenderedHTML}}
 				<pre>{{if .FileContent}}{{.FileContent | Str2html}}{{end}}</pre>
-			{{else if not .IsTextFile}}
+			{{else if not .IsTextSource}}
 				<div class="view-raw ui center">
 					{{if .IsImageFile}}
 						<img src="{{EscapePound $.RawFileLink}}">