mirror of https://github.com/perkeep/perkeep.git
118 lines
3.5 KiB
Go
118 lines
3.5 KiB
Go
/*
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Copyright 2015 The Camlistore Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package server
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import (
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"encoding/json"
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"fmt"
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"html/template"
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"net/http"
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"sync"
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"camlistore.org/pkg/blobserver"
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"camlistore.org/pkg/httputil"
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"camlistore.org/pkg/jsonconfig"
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"camlistore.org/pkg/types/clientconfig"
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)
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const helpHTML string = `<html>
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<head>
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<title>Help</title>
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</head>
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<body>
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<h2>Help</h2>
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<h3>Web User Interface</h3>
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<p><a href='https://camlistore.googlesource.com/camlistore/+/master/doc/search-ui.txt'>Search bar predicates.</a></p>
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<h3>Client Configuration</h3>
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<p>You will need to use the following <a href='http://camlistore.org/docs/client-config'>client configuration</a> in order to access this server using the Camlistore command line tools.</p>
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<pre>{{ . }}</pre>
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<h3>Anything Else?</h3>
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<p>See the Camlistore <a href='http://camlistore.org/docs/'>online documentation</a> and <a href='http://camlistore.org/community/'>community contacts</a>.</p>
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</body>
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</html>`
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// HelpHandler publishes information related to accessing the server
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type HelpHandler struct {
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clientConfig *clientconfig.Config // generated from serverConfig
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serverConfig jsonconfig.Obj // low-level config
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goTemplate *template.Template // for rendering
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}
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// setServerConfigOnce guards operation within SetServerConfig
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var setServerConfigOnce sync.Once
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// SetServerConfig enables the handler to receive the server config
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// before InitHandler, which generates a client config from the server config, is called.
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func (hh *HelpHandler) SetServerConfig(config jsonconfig.Obj) {
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setServerConfigOnce.Do(func() { hh.serverConfig = config })
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}
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func init() {
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blobserver.RegisterHandlerConstructor("help", newHelpFromConfig)
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}
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func (hh *HelpHandler) InitHandler(hl blobserver.FindHandlerByTyper) error {
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if hh.serverConfig == nil {
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return fmt.Errorf("HelpHandler's serverConfig must be set before calling its InitHandler")
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}
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clientConfig, err := clientconfig.GenerateClientConfig(hh.serverConfig)
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if err != nil {
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return fmt.Errorf("error generating client config: %v", err)
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}
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hh.clientConfig = clientConfig
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tmpl, err := template.New("help").Parse(helpHTML)
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if err != nil {
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return fmt.Errorf("error creating template: %v", err)
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}
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hh.goTemplate = tmpl
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return nil
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}
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func newHelpFromConfig(ld blobserver.Loader, conf jsonconfig.Obj) (h http.Handler, err error) {
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return &HelpHandler{}, nil
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}
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func (hh *HelpHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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suffix := httputil.PathSuffix(req)
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if !httputil.IsGet(req) {
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http.Error(rw, "Illegal help method.", http.StatusMethodNotAllowed)
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return
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}
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switch suffix {
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case "":
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hh.serveHelpHTML(rw, req)
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default:
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http.Error(rw, "Illegal help path.", http.StatusNotFound)
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}
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}
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func (hh *HelpHandler) serveHelpHTML(rw http.ResponseWriter, req *http.Request) {
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jsonBytes, err := json.MarshalIndent(hh.clientConfig, "", " ")
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if err != nil {
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httputil.ServeError(rw, req, fmt.Errorf("could not serialize client config JSON: %v", err))
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return
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}
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hh.goTemplate.Execute(rw, string(jsonBytes))
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}
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