diff options
Diffstat (limited to 'utils')
| -rw-r--r-- | utils/api.go | 13 | ||||
| -rw-r--r-- | utils/api_test.go | 4 | ||||
| -rw-r--r-- | utils/subpath.go | 148 | ||||
| -rw-r--r-- | utils/subpath_test.go | 192 |
4 files changed, 351 insertions, 6 deletions
diff --git a/utils/api.go b/utils/api.go index b5e490eb7..d14f316b6 100644 --- a/utils/api.go +++ b/utils/api.go @@ -11,6 +11,7 @@ import ( "html/template" "net/http" "net/url" + "path" "strings" "github.com/mattermost/mattermost-server/model" @@ -35,24 +36,26 @@ func OriginChecker(allowedOrigins string) func(*http.Request) bool { } } -func RenderWebAppError(w http.ResponseWriter, r *http.Request, err *model.AppError, s crypto.Signer) { - RenderWebError(w, r, err.StatusCode, url.Values{ +func RenderWebAppError(config *model.Config, w http.ResponseWriter, r *http.Request, err *model.AppError, s crypto.Signer) { + RenderWebError(config, w, r, err.StatusCode, url.Values{ "message": []string{err.Message}, }, s) } -func RenderWebError(w http.ResponseWriter, r *http.Request, status int, params url.Values, s crypto.Signer) { +func RenderWebError(config *model.Config, w http.ResponseWriter, r *http.Request, status int, params url.Values, s crypto.Signer) { queryString := params.Encode() + subpath, _ := GetSubpathFromConfig(config) + h := crypto.SHA256 sum := h.New() - sum.Write([]byte("/error?" + queryString)) + sum.Write([]byte(path.Join(subpath, "error") + "?" + queryString)) signature, err := s.Sign(rand.Reader, sum.Sum(nil), h) if err != nil { http.Error(w, "", http.StatusInternalServerError) return } - destination := "/error?" + queryString + "&s=" + base64.URLEncoding.EncodeToString(signature) + destination := path.Join(subpath, "error") + "?" + queryString + "&s=" + base64.URLEncoding.EncodeToString(signature) if status >= 300 && status < 400 { http.Redirect(w, r, destination, status) diff --git a/utils/api_test.go b/utils/api_test.go index 5e41c7bfe..d84207eaa 100644 --- a/utils/api_test.go +++ b/utils/api_test.go @@ -18,6 +18,8 @@ import ( "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" + + "github.com/mattermost/mattermost-server/model" ) func TestRenderWebError(t *testing.T) { @@ -25,7 +27,7 @@ func TestRenderWebError(t *testing.T) { w := httptest.NewRecorder() key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader) require.NoError(t, err) - RenderWebError(w, r, http.StatusTemporaryRedirect, url.Values{ + RenderWebError(&model.Config{}, w, r, http.StatusTemporaryRedirect, url.Values{ "foo": []string{"bar"}, }, key) diff --git a/utils/subpath.go b/utils/subpath.go new file mode 100644 index 000000000..cddc90fa4 --- /dev/null +++ b/utils/subpath.go @@ -0,0 +1,148 @@ +// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved. +// See License.txt for license information. + +package utils + +import ( + "crypto/sha256" + "encoding/base64" + "fmt" + "io/ioutil" + "net/url" + "os" + "path" + "path/filepath" + "regexp" + "strings" + + "github.com/pkg/errors" + + "github.com/mattermost/mattermost-server/mlog" + "github.com/mattermost/mattermost-server/model" +) + +// UpdateAssetsSubpath rewrites assets in the /client directory to assume the application is hosted +// at the given subpath instead of at the root. No changes are written unless necessary. +func UpdateAssetsSubpath(subpath string) error { + if subpath == "" { + subpath = "/" + } + + staticDir, found := FindDir(model.CLIENT_DIR) + if !found { + return errors.New("failed to find client dir") + } + + staticDir, err := filepath.EvalSymlinks(staticDir) + if err != nil { + return errors.Wrapf(err, "failed to resolve symlinks to %s", staticDir) + } + + rootHtmlPath := filepath.Join(staticDir, "root.html") + oldRootHtml, err := ioutil.ReadFile(rootHtmlPath) + if err != nil { + return errors.Wrap(err, "failed to open root.html") + } + + pathToReplace := "/static/" + newPath := path.Join(subpath, "static") + "/" + + // Determine if a previous subpath had already been rewritten into the assets. + reWebpackPublicPathScript := regexp.MustCompile("window.publicPath='([^']+)'") + alreadyRewritten := false + if matches := reWebpackPublicPathScript.FindStringSubmatch(string(oldRootHtml)); matches != nil { + pathToReplace = matches[1] + alreadyRewritten = true + } + + if pathToReplace == newPath { + mlog.Debug("No rewrite required for static assets", mlog.String("path", pathToReplace)) + return nil + } + + mlog.Debug("Rewriting static assets", mlog.String("from_path", pathToReplace), mlog.String("to_path", newPath)) + + newRootHtml := string(oldRootHtml) + + // Compute the sha256 hash for the inline script and reference same in the CSP meta tag. + // This allows the inline script defining `window.publicPath` to bypass CSP protections. + script := fmt.Sprintf("window.publicPath='%s'", newPath) + scriptHash := sha256.Sum256([]byte(script)) + + reCSP := regexp.MustCompile(`<meta http-equiv=Content-Security-Policy content="script-src 'self' cdn.segment.com/analytics.js/ 'unsafe-eval'([^"]*)">`) + newRootHtml = reCSP.ReplaceAllLiteralString(newRootHtml, fmt.Sprintf( + `<meta http-equiv=Content-Security-Policy content="script-src 'self' cdn.segment.com/analytics.js/ 'unsafe-eval' 'sha256-%s'">`, + base64.StdEncoding.EncodeToString(scriptHash[:]), + )) + + // Rewrite the root.html references to `/static/*` to include the given subpath. This + // potentially includes a previously injected inline script. + newRootHtml = strings.Replace(newRootHtml, pathToReplace, newPath, -1) + + // Inject the script, if needed, to define `window.publicPath`. + if !alreadyRewritten { + newRootHtml = strings.Replace(newRootHtml, "</style>", fmt.Sprintf("</style><script>%s</script>", script), 1) + } + + // Write out the updated root.html. + if err = ioutil.WriteFile(rootHtmlPath, []byte(newRootHtml), 0); err != nil { + return errors.Wrapf(err, "failed to update root.html with subpath %s", subpath) + } + + // Rewrite the *.css references to `/static/*` (or a previously rewritten subpath). + err = filepath.Walk(staticDir, func(walkPath string, info os.FileInfo, err error) error { + if filepath.Ext(walkPath) == ".css" { + if oldCss, err := ioutil.ReadFile(walkPath); err != nil { + return errors.Wrapf(err, "failed to open %s", walkPath) + } else { + newCss := strings.Replace(string(oldCss), pathToReplace, newPath, -1) + if err = ioutil.WriteFile(walkPath, []byte(newCss), 0); err != nil { + return errors.Wrapf(err, "failed to update %s with subpath %s", walkPath, subpath) + } + } + } + + return nil + }) + if err != nil { + return errors.Wrapf(err, "error walking %s", staticDir) + } + + return nil +} + +// UpdateAssetsSubpathFromConfig uses UpdateAssetsSubpath and any path defined in the SiteURL. +func UpdateAssetsSubpathFromConfig(config *model.Config) error { + // Don't rewrite in development environments, since webpack in developer mode constantly + // updates the assets and must be configured separately. + if model.BuildNumber == "dev" { + mlog.Debug("Skipping update to assets subpath since dev build") + return nil + } + + subpath, err := GetSubpathFromConfig(config) + if err != nil { + return err + } + + return UpdateAssetsSubpath(subpath) +} + +func GetSubpathFromConfig(config *model.Config) (string, error) { + if config == nil { + return "", errors.New("no config provided") + } else if config.ServiceSettings.SiteURL == nil { + return "/", nil + } + + u, err := url.Parse(*config.ServiceSettings.SiteURL) + if err != nil { + return "", errors.Wrap(err, "failed to parse SiteURL from config") + } + + if u.Path == "" { + return "/", nil + } + + return path.Clean(u.Path), nil +} diff --git a/utils/subpath_test.go b/utils/subpath_test.go new file mode 100644 index 000000000..ee518d5f6 --- /dev/null +++ b/utils/subpath_test.go @@ -0,0 +1,192 @@ +package utils_test + +import ( + "io/ioutil" + "os" + "path/filepath" + "testing" + + "github.com/stretchr/testify/require" + + "github.com/mattermost/mattermost-server/model" + "github.com/mattermost/mattermost-server/utils" +) + +func TestUpdateAssetsSubpath(t *testing.T) { + t.Run("no client dir", func(t *testing.T) { + tempDir, err := ioutil.TempDir("", "test_update_assets_subpath") + require.NoError(t, err) + defer os.RemoveAll(tempDir) + os.Chdir(tempDir) + + err = utils.UpdateAssetsSubpath("/") + require.Error(t, err) + }) + + t.Run("valid", func(t *testing.T) { + tempDir, err := ioutil.TempDir("", "test_update_assets_subpath") + require.NoError(t, err) + defer os.RemoveAll(tempDir) + os.Chdir(tempDir) + + err = os.Mkdir(model.CLIENT_DIR, 0700) + require.NoError(t, err) + + testCases := []struct { + Description string + RootHTML string + MainCSS string + Subpath string + ExpectedRootHTML string + ExpectedMainCSS string + }{ + { + "no changes required, empty subpath provided", + baseRootHtml, + baseCss, + "", + baseRootHtml, + baseCss, + }, + { + "no changes required", + baseRootHtml, + baseCss, + "/", + baseRootHtml, + baseCss, + }, + { + "subpath", + baseRootHtml, + baseCss, + "/subpath", + subpathRootHtml, + subpathCss, + }, + { + "new subpath from old", + subpathRootHtml, + subpathCss, + "/nested/subpath", + newSubpathRootHtml, + newSubpathCss, + }, + { + "resetting to /", + subpathRootHtml, + subpathCss, + "/", + resetRootHtml, + baseCss, + }, + } + + for _, testCase := range testCases { + t.Run(testCase.Description, func(t *testing.T) { + ioutil.WriteFile(filepath.Join(tempDir, model.CLIENT_DIR, "root.html"), []byte(testCase.RootHTML), 0700) + ioutil.WriteFile(filepath.Join(tempDir, model.CLIENT_DIR, "main.css"), []byte(testCase.MainCSS), 0700) + err := utils.UpdateAssetsSubpath(testCase.Subpath) + require.NoError(t, err) + + contents, err := ioutil.ReadFile(filepath.Join(tempDir, model.CLIENT_DIR, "root.html")) + require.NoError(t, err) + require.Equal(t, testCase.ExpectedRootHTML, string(contents)) + + contents, err = ioutil.ReadFile(filepath.Join(tempDir, model.CLIENT_DIR, "main.css")) + require.NoError(t, err) + require.Equal(t, testCase.ExpectedMainCSS, string(contents)) + + }) + } + }) +} + +func TestGetSubpathFromConfig(t *testing.T) { + sToP := func(s string) *string { + return &s + } + + testCases := []struct { + Description string + SiteURL *string + ExpectedError bool + ExpectedSubpath string + }{ + { + "empty SiteURL", + sToP(""), + false, + "/", + }, + { + "invalid SiteURL", + sToP("cache_object:foo/bar"), + true, + "", + }, + { + "nil SiteURL", + nil, + false, + "/", + }, + { + "no trailing slash", + sToP("http://localhost:8065"), + false, + "/", + }, + { + "trailing slash", + sToP("http://localhost:8065/"), + false, + "/", + }, + { + "subpath, no trailing slash", + sToP("http://localhost:8065/subpath"), + false, + "/subpath", + }, + { + "trailing slash", + sToP("http://localhost:8065/subpath/"), + false, + "/subpath", + }, + } + + for _, testCase := range testCases { + t.Run(testCase.Description, func(t *testing.T) { + config := &model.Config{ + ServiceSettings: model.ServiceSettings{ + SiteURL: testCase.SiteURL, + }, + } + + subpath, err := utils.GetSubpathFromConfig(config) + if testCase.ExpectedError { + require.Error(t, err) + } else { + require.NoError(t, err) + } + + require.Equal(t, testCase.ExpectedSubpath, subpath) + }) + } +} + +const baseRootHtml = `<!DOCTYPE html> <html lang=en> <head> <meta charset=utf-8> <meta http-equiv=Content-Security-Policy content="script-src 'self' cdn.segment.com/analytics.js/ 'unsafe-eval'"> <meta http-equiv=X-UA-Compatible content="IE=edge"> <meta name=viewport content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=0"> <meta name=robots content="noindex, nofollow"> <meta name=referrer content=no-referrer> <title>Mattermost</title> <meta name=apple-mobile-web-app-capable content=yes> <meta name=apple-mobile-web-app-status-bar-style content=default> <meta name=mobile-web-app-capable content=yes> <meta name=apple-mobile-web-app-title content=Mattermost> <meta name=application-name content=Mattermost> <meta name=format-detection content="telephone=no"> <link rel=apple-touch-icon sizes=57x57 href=/static/files/78b7e73b41b8731ce2c41c870ecc8886.png> <link rel=apple-touch-icon sizes=60x60 href=/static/files/51d00ffd13afb6d74fd8f6dfdeef768a.png> <link rel=apple-touch-icon sizes=72x72 href=/static/files/23645596f8f78f017bd4d457abb855c4.png> <link rel=apple-touch-icon sizes=76x76 href=/static/files/26e9d72f472663a00b4b206149459fab.png> <link rel=apple-touch-icon sizes=144x144 href=/static/files/7bd91659bf3fc8c68fcd45fc1db9c630.png> <link rel=apple-touch-icon sizes=120x120 href=/static/files/fa69ffe11eb334aaef5aece8d848ca62.png> <link rel=apple-touch-icon sizes=152x152 href=/static/files/f046777feb6ab12fc43b8f9908b1db35.png> <link rel=icon type=image/png sizes=16x16 href=/static/files/02b96247d275680adaaabf01c71c571d.png> <link rel=icon type=image/png sizes=32x32 href=/static/files/1d9020f201a6762421cab8d30624fdd8.png> <link rel=icon type=image/png sizes=96x96 href=/static/files/fe23af39ae98d77dc26ae8586565970f.png> <link rel=icon type=image/png sizes=192x192 href=/static/files/d7ff68a7675f84337cc154c3d4abe713.png> <link rel=manifest href=/static/files/a985ad72552ad069537d6eea81e719c7.json> <link rel=stylesheet class=code_theme> <style>.error-screen{font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;padding-top:50px;max-width:750px;font-size:14px;color:#333;margin:auto;display:none;line-height:1.5}.error-screen h2{font-size:30px;font-weight:400;line-height:1.2}.error-screen ul{padding-left:15px;line-height:1.7;margin-top:0;margin-bottom:10px}.error-screen hr{color:#ddd;margin-top:20px;margin-bottom:20px;border:0;border-top:1px solid #eee}.error-screen-visible{display:block}</style> <link href="/static/main.364fd054d7a6d741efc6.css" rel="stylesheet"><script type="text/javascript" src="/static/main.e49599ac425584ffead5.js"></script></head> <body class=font--open_sans> <div id=root> <div class=error-screen> <h2>Cannot connect to Mattermost</h2> <hr/> <p>We're having trouble connecting to Mattermost. If refreshing this page (Ctrl+R or Command+R) does not work, please verify that your computer is connected to the internet.</p> <br/> </div> <div class=loading-screen style=position:relative> <div class=loading__content> <div class="round round-1"></div> <div class="round round-2"></div> <div class="round round-3"></div> </div> </div> </div> <noscript> To use Mattermost, please enable JavaScript. </noscript> </body> </html>` + +const baseCss = `@font-face{font-family:FontAwesome;src:url(/static/files/674f50d287a8c48dc19ba404d20fe713.eot);src:url(/static/files/674f50d287a8c48dc19ba404d20fe713.eot?#iefix&v=4.7.0) format("embedded-opentype"),url(/static/files/af7ae505a9eed503f8b8e6982036873e.woff2) format("woff2"),url(/static/files/fee66e712a8a08eef5805a46892932ad.woff) format("woff"),url(/static/files/b06871f281fee6b241d60582ae9369b9.ttf) format("truetype"),url(/static/files/677433a0892aaed7b7d2628c313c9775.svg#fontawesomeregular) format("svg");font-weight:400;font-style:normal}` + +const subpathRootHtml = `<!DOCTYPE html> <html lang=en> <head> <meta charset=utf-8> <meta http-equiv=Content-Security-Policy content="script-src 'self' cdn.segment.com/analytics.js/ 'unsafe-eval' 'sha256-tPOjw+tkVs9axL78ZwGtYl975dtyPHB6LYKAO2R3gR4='"> <meta http-equiv=X-UA-Compatible content="IE=edge"> <meta name=viewport content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=0"> <meta name=robots content="noindex, nofollow"> <meta name=referrer content=no-referrer> <title>Mattermost</title> <meta name=apple-mobile-web-app-capable content=yes> <meta name=apple-mobile-web-app-status-bar-style content=default> <meta name=mobile-web-app-capable content=yes> <meta name=apple-mobile-web-app-title content=Mattermost> <meta name=application-name content=Mattermost> <meta name=format-detection content="telephone=no"> <link rel=apple-touch-icon sizes=57x57 href=/subpath/static/files/78b7e73b41b8731ce2c41c870ecc8886.png> <link rel=apple-touch-icon sizes=60x60 href=/subpath/static/files/51d00ffd13afb6d74fd8f6dfdeef768a.png> <link rel=apple-touch-icon sizes=72x72 href=/subpath/static/files/23645596f8f78f017bd4d457abb855c4.png> <link rel=apple-touch-icon sizes=76x76 href=/subpath/static/files/26e9d72f472663a00b4b206149459fab.png> <link rel=apple-touch-icon sizes=144x144 href=/subpath/static/files/7bd91659bf3fc8c68fcd45fc1db9c630.png> <link rel=apple-touch-icon sizes=120x120 href=/subpath/static/files/fa69ffe11eb334aaef5aece8d848ca62.png> <link rel=apple-touch-icon sizes=152x152 href=/subpath/static/files/f046777feb6ab12fc43b8f9908b1db35.png> <link rel=icon type=image/png sizes=16x16 href=/subpath/static/files/02b96247d275680adaaabf01c71c571d.png> <link rel=icon type=image/png sizes=32x32 href=/subpath/static/files/1d9020f201a6762421cab8d30624fdd8.png> <link rel=icon type=image/png sizes=96x96 href=/subpath/static/files/fe23af39ae98d77dc26ae8586565970f.png> <link rel=icon type=image/png sizes=192x192 href=/subpath/static/files/d7ff68a7675f84337cc154c3d4abe713.png> <link rel=manifest href=/subpath/static/files/a985ad72552ad069537d6eea81e719c7.json> <link rel=stylesheet class=code_theme> <style>.error-screen{font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;padding-top:50px;max-width:750px;font-size:14px;color:#333;margin:auto;display:none;line-height:1.5}.error-screen h2{font-size:30px;font-weight:400;line-height:1.2}.error-screen ul{padding-left:15px;line-height:1.7;margin-top:0;margin-bottom:10px}.error-screen hr{color:#ddd;margin-top:20px;margin-bottom:20px;border:0;border-top:1px solid #eee}.error-screen-visible{display:block}</style><script>window.publicPath='/subpath/static/'</script> <link href="/subpath/static/main.364fd054d7a6d741efc6.css" rel="stylesheet"><script type="text/javascript" src="/subpath/static/main.e49599ac425584ffead5.js"></script></head> <body class=font--open_sans> <div id=root> <div class=error-screen> <h2>Cannot connect to Mattermost</h2> <hr/> <p>We're having trouble connecting to Mattermost. If refreshing this page (Ctrl+R or Command+R) does not work, please verify that your computer is connected to the internet.</p> <br/> </div> <div class=loading-screen style=position:relative> <div class=loading__content> <div class="round round-1"></div> <div class="round round-2"></div> <div class="round round-3"></div> </div> </div> </div> <noscript> To use Mattermost, please enable JavaScript. </noscript> </body> </html>` + +const subpathCss = `@font-face{font-family:FontAwesome;src:url(/subpath/static/files/674f50d287a8c48dc19ba404d20fe713.eot);src:url(/subpath/static/files/674f50d287a8c48dc19ba404d20fe713.eot?#iefix&v=4.7.0) format("embedded-opentype"),url(/subpath/static/files/af7ae505a9eed503f8b8e6982036873e.woff2) format("woff2"),url(/subpath/static/files/fee66e712a8a08eef5805a46892932ad.woff) format("woff"),url(/subpath/static/files/b06871f281fee6b241d60582ae9369b9.ttf) format("truetype"),url(/subpath/static/files/677433a0892aaed7b7d2628c313c9775.svg#fontawesomeregular) format("svg");font-weight:400;font-style:normal}` + +const newSubpathRootHtml = `<!DOCTYPE html> <html lang=en> <head> <meta charset=utf-8> <meta http-equiv=Content-Security-Policy content="script-src 'self' cdn.segment.com/analytics.js/ 'unsafe-eval' 'sha256-mbRaPRRpWz6MNkX9SyXWMJ8XnWV4w/DoqK2M0ryUAvc='"> <meta http-equiv=X-UA-Compatible content="IE=edge"> <meta name=viewport content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=0"> <meta name=robots content="noindex, nofollow"> <meta name=referrer content=no-referrer> <title>Mattermost</title> <meta name=apple-mobile-web-app-capable content=yes> <meta name=apple-mobile-web-app-status-bar-style content=default> <meta name=mobile-web-app-capable content=yes> <meta name=apple-mobile-web-app-title content=Mattermost> <meta name=application-name content=Mattermost> <meta name=format-detection content="telephone=no"> <link rel=apple-touch-icon sizes=57x57 href=/nested/subpath/static/files/78b7e73b41b8731ce2c41c870ecc8886.png> <link rel=apple-touch-icon sizes=60x60 href=/nested/subpath/static/files/51d00ffd13afb6d74fd8f6dfdeef768a.png> <link rel=apple-touch-icon sizes=72x72 href=/nested/subpath/static/files/23645596f8f78f017bd4d457abb855c4.png> <link rel=apple-touch-icon sizes=76x76 href=/nested/subpath/static/files/26e9d72f472663a00b4b206149459fab.png> <link rel=apple-touch-icon sizes=144x144 href=/nested/subpath/static/files/7bd91659bf3fc8c68fcd45fc1db9c630.png> <link rel=apple-touch-icon sizes=120x120 href=/nested/subpath/static/files/fa69ffe11eb334aaef5aece8d848ca62.png> <link rel=apple-touch-icon sizes=152x152 href=/nested/subpath/static/files/f046777feb6ab12fc43b8f9908b1db35.png> <link rel=icon type=image/png sizes=16x16 href=/nested/subpath/static/files/02b96247d275680adaaabf01c71c571d.png> <link rel=icon type=image/png sizes=32x32 href=/nested/subpath/static/files/1d9020f201a6762421cab8d30624fdd8.png> <link rel=icon type=image/png sizes=96x96 href=/nested/subpath/static/files/fe23af39ae98d77dc26ae8586565970f.png> <link rel=icon type=image/png sizes=192x192 href=/nested/subpath/static/files/d7ff68a7675f84337cc154c3d4abe713.png> <link rel=manifest href=/nested/subpath/static/files/a985ad72552ad069537d6eea81e719c7.json> <link rel=stylesheet class=code_theme> <style>.error-screen{font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;padding-top:50px;max-width:750px;font-size:14px;color:#333;margin:auto;display:none;line-height:1.5}.error-screen h2{font-size:30px;font-weight:400;line-height:1.2}.error-screen ul{padding-left:15px;line-height:1.7;margin-top:0;margin-bottom:10px}.error-screen hr{color:#ddd;margin-top:20px;margin-bottom:20px;border:0;border-top:1px solid #eee}.error-screen-visible{display:block}</style><script>window.publicPath='/nested/subpath/static/'</script> <link href="/nested/subpath/static/main.364fd054d7a6d741efc6.css" rel="stylesheet"><script type="text/javascript" src="/nested/subpath/static/main.e49599ac425584ffead5.js"></script></head> <body class=font--open_sans> <div id=root> <div class=error-screen> <h2>Cannot connect to Mattermost</h2> <hr/> <p>We're having trouble connecting to Mattermost. 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