147 lines
3.5 KiB
Go
147 lines
3.5 KiB
Go
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package main
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import (
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"flag"
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"fmt"
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"html/template"
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"log"
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"net"
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"net/http"
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"strings"
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"golang.org/x/net/dict"
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)
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func main() {
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dictServer := flag.String("dict-server", "dict.org:2628", "Specify the dict server address and port")
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listenAddr := flag.String("listen-addr", ":3010", "Specify the local listen address, prefix with unix: for a Unix domain socket")
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flag.Parse()
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var listener net.Listener
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var err error
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if strings.HasPrefix(*listenAddr, "unix:") {
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listener, err = net.Listen("unix", strings.TrimPrefix(*listenAddr, "unix:"))
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} else {
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listener, err = net.Listen("tcp", *listenAddr)
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}
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if err != nil {
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log.Fatalf("Error listening on %s: %v", *listenAddr, err)
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}
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http.HandleFunc("/", homeHandler)
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http.HandleFunc("/define", defineHandler(*dictServer))
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log.Printf("Listening on %s", *listenAddr)
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if err := http.Serve(listener, nil); err != nil {
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log.Fatal(err)
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}
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}
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func defineHandler(dictServer string) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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if err := r.ParseForm(); err != nil {
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log.Printf("error parsing form: %v", err)
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http.Error(w, "error parsing form", http.StatusBadRequest)
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return
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}
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word := r.Form.Get("word")
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var params TmplParams
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if len(word) > 0 {
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defs, err := getDefinitions(dictServer, word)
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if err != nil {
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log.Printf("error defining %s: %v", word, err)
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http.Error(w, fmt.Sprintf("error getting definition for %s: %v", word, err), http.StatusInternalServerError)
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return
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}
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params.ShowResults = true
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params.SearchTerm = word
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params.Definitions = defs
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}
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renderTemplate(w, home, params)
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}
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}
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func homeHandler(w http.ResponseWriter, r *http.Request) {
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renderTemplate(w, home, TmplParams{})
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}
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func renderTemplate(w http.ResponseWriter, t *template.Template, params TmplParams) {
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err := t.Execute(w, params)
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if err != nil {
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log.Printf("Error rendering template %s: %v", t.Name(), err)
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http.Error(w, "Internal server error", http.StatusInternalServerError)
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}
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}
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func getDefinitions(serverAddr string, word string) ([]*dict.Defn, error) {
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cli, err := dict.Dial("tcp", serverAddr)
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if err != nil {
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return nil, fmt.Errorf("error connectiong to %s: %v", serverAddr, err)
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}
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defer cli.Close()
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defs, err := cli.Define("*", word)
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if err != nil {
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if strings.Contains(err.Error(), "552 no match") {
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return nil, nil
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}
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return nil, fmt.Errorf("error from dict server: %v", err)
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}
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return defs, nil
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}
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type TmplParams struct {
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SearchTerm string
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ShowResults bool
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Definitions []*dict.Defn
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}
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var home = template.Must(template.New("home").Parse(`
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<link rel="stylesheet" href="https://cdn.simplecss.org/simple.min.css">
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<style>
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div.center {
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text-align: center;
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}
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div#results {
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height: 60dvh;
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}
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</style>
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<title>Dictionary Server</title>
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</head>
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<body>
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<header>
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<h1>Dictionary Server</h1>
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</header>
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<main>
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<form action="/define" method="get">
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<div class="center">
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<input id="word" type="text" name="word" required autofocus></input>
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<button name="search">Search</button>
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</div>
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</form>
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{{if .ShowResults}}
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<div id="results">
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{{with .Definitions}}
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{{range .}}
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<h3>From {{.Dict.Desc}}</h3>
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<pre>{{.Text|printf "%s"}}</pre>
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{{end}}
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{{else}}
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<p>
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Found no definitions for {{.SearchTerm}}
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</p>
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{{end}}
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</div>
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{{end}}
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</main>
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</body>
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</html>
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`))
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