Rename --host => --root-url

assets/templates/html/index.html.tmpl

@@ -28,10 +28,10 @@ the command line.
 <h2>Command line API</h2>
 <pre>
     # Upload a file
-    curl -F'file=@yourfile.png' <a href="{{.Host}}">{{.Host}}</a>
+    curl -F'file=@yourfile.png' <a href="{{.RootURL}}">{{.RootURL}}</a>
 
     # Shorten a URL
-    curl -F'shorten=http://example.com/some/long/url' <a href="{{.Host}}">{{.Host}}</a>
+    curl -F'shorten=http://example.com/some/long/url' <a href="{{.RootURL}}">{{.RootURL}}</a>
 
     # The first line of the result will contain the shortened URL.
     #
@@ -39,6 +39,6 @@ the command line.
     # information on how to delete the shortened object.
 
     # To upload a file and only extract the shortened URL (i.e. throw away the rest)
-    curl -F'file=@yourfile.png' <a href="{{.Host}}">{{.Host}}</a> | head -n 1
+    curl -F'file=@yourfile.png' <a href="{{.RootURL}}">{{.RootURL}}</a> | head -n 1
 </pre>
 {{end}}

assets/templates/html/pasteMeta.html.tmpl

@@ -4,10 +4,10 @@
 
 {{define "body"}}
 <pre>
-<a href="{{.Host}}/{{.Paste.Key}}{{.FileExt}}">{{.Host}}/{{.Paste.Key}}{{.FileExt}}</a>
+<a href="{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}">{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}</a>
 ---
 {{if and (ne .Paste.State.String "deleted") .CanDeleteBool}}
-with delete token: <a href="{{.Host}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}">{{.Host}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}</a>
+with delete token: <a href="{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}">{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}</a>
 {{else -}}
 with delete token: &lt;unknown&gt;
 {{end -}}
@@ -22,7 +22,7 @@ delete token: {{.CanDelete}}
 
 {{if and (ne .Paste.State.String "deleted") .CanDeleteBool}}
 ```
-curl --request "DELETE" "<a href="{{.Host}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}">{{.Host}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}"</a>
+curl --request "DELETE" "<a href="{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}">{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}"</a>
 ```
 </pre>
 {{end}}

assets/templates/txt/index.txt.tmpl

@@ -7,10 +7,10 @@ the command line.
 ## USAGE
 
     # Upload a file
-    curl -F'file=@yourfile.png' {{.Host}}
+    curl -F'file=@yourfile.png' {{.RootURL}}
 
     # Shorten a URL
-    curl -F'shorten=http://example.com/some/long/url' {{.Host}}
+    curl -F'shorten=http://example.com/some/long/url' {{.RootURL}}
 
     # The first line of the result will contain the shortened URL.
     #
@@ -18,4 +18,4 @@ the command line.
     # information on how to delete the shortened object.
 
     # To upload a file and only extract the shortened URL (i.e. throw away the rest)
-    curl -F'file=@yourfile.png' {{.Host}} | head -n 1
+    curl -F'file=@yourfile.png' {{.RootURL}} | head -n 1

assets/templates/txt/pasteMeta.txt.tmpl

@@ -1,7 +1,7 @@
-{{.Host}}/{{.Paste.Key}}{{.FileExt}}
+{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}
 ---
 {{if and (ne .Paste.State.String "deleted") .CanDeleteBool}}
-with delete token: {{.Host}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Request.URL.Query.Get "deleteToken"}}
+with delete token: {{.RootURL}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}
 {{else -}}
 with delete token: <unknown>
 {{end -}}type: {{.Paste.Type}}
@@ -16,6 +16,6 @@ delete token: {{.CanDelete}}
 {{if and (ne .Paste.State.String "deleted") .CanDeleteBool}}
 ```
 # To delete this {{.Paste.Type}}, execute:
-curl --request "DELETE" "{{.Host}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}"
+curl --request "DELETE" "{{.RootURL}}/{{.Paste.Key}}{{.FileExt}}?deleteToken={{.Paste.DeleteToken}}"
 ```
 {{end}}

cmd/rushlink/main.go

@@ -13,7 +13,7 @@ var (
 	fileStorePath = flag.String("file-store", "", "path to the directory where uploaded files will be stored")
 	httpListen    = flag.String("listen", "127.0.0.1:8000", "listen address (host:port)")
 	metricsListen = flag.String("metrics_listen", "127.0.0.1:58614", "listen address for metrics (host:port)")
-	hostURL       = flag.String("host", "", "host root (defaults to using the request 'Host' header with HTTPS")
+	rootURL       = flag.String("root_url", "", "host root (example: 'https://example.com', uses an educated guess if omitted)")
 )
 
 func main() {
@@ -30,5 +30,5 @@ func main() {
 	defer database.Close()
 
 	go rushlink.StartMetricsServer(*metricsListen, database, filestore)
-	rushlink.StartMainServer(*httpListen, database, filestore, hostURL)
+	rushlink.StartMainServer(*httpListen, database, filestore, *rootURL)
 }

router.go

@@ -21,11 +21,11 @@ const urlKeyWithExtExpr = urlKeyExpr + "{ext:\\.[A-Za-z0-9-_]+}"
 type rushlink struct {
 	db      *db.Database
 	fs      *db.FileStore
-	host *url.URL
+	rootURL *url.URL
 }
 
-func (rl *rushlink) Host() *url.URL {
+func (rl *rushlink) RootURL() *url.URL {
-	return rl.host
+	return rl.rootURL
 }
 
 func (rl *rushlink) recoveryMiddleware(next http.Handler) http.Handler {
@@ -80,21 +80,19 @@ func (w *statusResponseWriter) WriteHeader(statusCode int) {
 }
 
 // StartMainServer starts the main http server listening on addr.
-func StartMainServer(addr string, db *db.Database, fs *db.FileStore, rawhost *string) {
+func StartMainServer(addr string, db *db.Database, fs *db.FileStore, rawRootURL string) {
-	var host *url.URL
+	var rootURL *url.URL
-	if rawhost != nil {
+	if rawRootURL != "" {
 		var err error
-		host, err = url.Parse(*rawhost)
+		rootURL, err = url.Parse(rawRootURL)
 		if err != nil {
-			log.Fatalln(errors.Wrap(err, "could not parse host flag"))
+			log.Fatalln(errors.Wrap(err, "could not parse rootURL flag"))
 		}
-	} else {
-		log.Println("warning: the --host flag will be required in the future")
 	}
 	rl := rushlink{
 		db:      db,
 		fs:      fs,
-		host: host,
+		rootURL: rootURL,
 	}
 
 	// Initialize Gorilla router

views.go

@@ -21,7 +21,7 @@ import (
 	"github.com/pkg/errors"
 )
 
-const defaultScheme = "https"
+const defaultScheme = "http"
 
 // Plain text templates
 var textBaseTemplate *text.Template = text.Must(text.New("").Parse(string(MustAsset("templates/txt/base.txt.tmpl"))))
@@ -107,7 +107,7 @@ func (rl *rushlink) render(w http.ResponseWriter, r *http.Request, tmplName stri
 	}
 
 	// Add the request to the template data
-	mapExtend(data, "Host", rl.resolveHost(r))
+	mapExtend(data, "RootURL", rl.resolveRootURL(r))
 	mapExtend(data, "Request", r)
 
 	switch contentType {
@@ -165,19 +165,38 @@ func (rl *rushlink) renderInternalServerError(w http.ResponseWriter, r *http.Req
 	rl.renderError(w, r, http.StatusInternalServerError, msg)
 }
 
-// resolveHost constructs the `scheme://host` part of rushlinks public API.
+// resolveRootURL constructs the `scheme://host` part of rushlinks public API.
 //
-// If the `--host` flag is set, it will return that URL.
+// If the `--root_url` flag is set, it will return that URL.
 // Otherwise, this function will return 'https://{Host}', where `{Host}` is
 // the value provided by the client in the HTTP `Host` header.  This value may
 // be invalid, but it is impossible to handle this error (because we *cannot*
 // know the real host).
-func (rl *rushlink) resolveHost(r *http.Request) string {
+func (rl *rushlink) resolveRootURL(r *http.Request) string {
-	rlHost := rl.Host()
+	rlHost := rl.RootURL()
 	if rlHost != nil {
+		// Root URL overridden by command line arguments
+		log.Println("override")
 		return rlHost.String()
 	}
-	return defaultScheme + r.Host
+
+	// Guess scheme
+	scheme := defaultScheme
+	forwardedScheme := r.Header.Get("X-Forwarded-Proto")
+	switch forwardedScheme {
+	case "http":
+		scheme = "http"
+		break
+	case "https":
+		scheme = "https"
+		break
+	}
+	// Guess host
+	host := r.Host
+	if forwardedHost := r.Header.Get("X-Forwarded-Host"); forwardedHost != "" {
+		host = forwardedHost
+	}
+	return scheme + "://" + host
 }
 
 // Try to resolve the preferred content-type for the response to this request.