133 lines
5.0 KiB
Go
133 lines
5.0 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package http
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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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"strings"
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"time"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/metrics"
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"github.com/ethereum/go-ethereum/swarm/api"
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)
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var (
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htmlCounter = metrics.NewRegisteredCounter("api.http.errorpage.html.count", nil)
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jsonCounter = metrics.NewRegisteredCounter("api.http.errorpage.json.count", nil)
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plaintextCounter = metrics.NewRegisteredCounter("api.http.errorpage.plaintext.count", nil)
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)
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type ResponseParams struct {
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Msg template.HTML
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Code int
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Timestamp string
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template *template.Template
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Details template.HTML
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}
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// ShowMultipleChoices is used when a user requests a resource in a manifest which results
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// in ambiguous results. It returns a HTML page with clickable links of each of the entry
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// in the manifest which fits the request URI ambiguity.
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// For example, if the user requests bzz:/<hash>/read and that manifest contains entries
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// "readme.md" and "readinglist.txt", a HTML page is returned with this two links.
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// This only applies if the manifest has no default entry
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func ShowMultipleChoices(w http.ResponseWriter, r *http.Request, list api.ManifestList) {
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log.Debug("ShowMultipleChoices", "ruid", GetRUID(r.Context()), "uri", GetURI(r.Context()))
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msg := ""
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if list.Entries == nil {
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respondError(w, r, "Could not resolve", http.StatusInternalServerError)
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return
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}
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requestUri := strings.TrimPrefix(r.RequestURI, "/")
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uri, err := api.Parse(requestUri)
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if err != nil {
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respondError(w, r, "Bad Request", http.StatusBadRequest)
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}
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uri.Scheme = "bzz-list"
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msg += fmt.Sprintf("Disambiguation:<br/>Your request may refer to multiple choices.<br/>Click <a class=\"orange\" href='"+"/"+uri.String()+"'>here</a> if your browser does not redirect you within 5 seconds.<script>setTimeout(\"location.href='%s';\",5000);</script><br/>", "/"+uri.String())
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respondTemplate(w, r, "error", msg, http.StatusMultipleChoices)
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}
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func respondTemplate(w http.ResponseWriter, r *http.Request, templateName, msg string, code int) {
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log.Debug("respondTemplate", "ruid", GetRUID(r.Context()), "uri", GetURI(r.Context()))
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respond(w, r, &ResponseParams{
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Code: code,
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Msg: template.HTML(msg),
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Timestamp: time.Now().Format(time.RFC1123),
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template: TemplatesMap[templateName],
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})
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}
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func respondError(w http.ResponseWriter, r *http.Request, msg string, code int) {
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log.Info("respondError", "ruid", GetRUID(r.Context()), "uri", GetURI(r.Context()), "code", code)
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respondTemplate(w, r, "error", msg, code)
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}
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func respond(w http.ResponseWriter, r *http.Request, params *ResponseParams) {
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w.WriteHeader(params.Code)
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if params.Code >= 400 {
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w.Header().Del("Cache-Control")
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w.Header().Del("ETag")
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}
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acceptHeader := r.Header.Get("Accept")
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// this cannot be in a switch since an Accept header can have multiple values: "Accept: */*, text/html, application/xhtml+xml, application/xml;q=0.9, */*;q=0.8"
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if strings.Contains(acceptHeader, "application/json") {
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if err := respondJSON(w, r, params); err != nil {
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respondError(w, r, "Internal server error", http.StatusInternalServerError)
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}
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} else if strings.Contains(acceptHeader, "text/html") {
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respondHTML(w, r, params)
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} else {
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respondPlaintext(w, r, params) //returns nice errors for curl
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}
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}
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func respondHTML(w http.ResponseWriter, r *http.Request, params *ResponseParams) {
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htmlCounter.Inc(1)
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log.Info("respondHTML", "ruid", GetRUID(r.Context()), "code", params.Code)
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err := params.template.Execute(w, params)
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if err != nil {
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log.Error(err.Error())
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}
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}
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func respondJSON(w http.ResponseWriter, r *http.Request, params *ResponseParams) error {
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jsonCounter.Inc(1)
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log.Info("respondJSON", "ruid", GetRUID(r.Context()), "code", params.Code)
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w.Header().Set("Content-Type", "application/json")
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return json.NewEncoder(w).Encode(params)
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}
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func respondPlaintext(w http.ResponseWriter, r *http.Request, params *ResponseParams) error {
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plaintextCounter.Inc(1)
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log.Info("respondPlaintext", "ruid", GetRUID(r.Context()), "code", params.Code)
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w.Header().Set("Content-Type", "text/plain")
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strToWrite := "Code: " + fmt.Sprintf("%d", params.Code) + "\n"
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strToWrite += "Message: " + string(params.Msg) + "\n"
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strToWrite += "Timestamp: " + params.Timestamp + "\n"
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_, err := w.Write([]byte(strToWrite))
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return err
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}
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