84 lines
2 KiB
Go
84 lines
2 KiB
Go
package main
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import (
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"log"
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"net/http"
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"net/url"
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"os"
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"regexp"
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"strings"
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)
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//go:generate go run scripts/includebangs.go
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func main() {
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http.HandleFunc("/eval", func(w http.ResponseWriter, r *http.Request) {
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searchQuery := r.URL.Query().Get("query")
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searchEngine := r.URL.Query().Get("engine")
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if searchQuery == "" || searchEngine == "" {
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http.Error(w, "400 Bad Request", http.StatusBadRequest)
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return
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}
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searchQuery, searchEngine = evaluateBang(searchQuery, searchEngine)
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searchURL := buildSearchURL(searchEngine, searchQuery)
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http.Redirect(w, r, searchURL, http.StatusSeeOther)
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})
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listenAddress := getSetting("LISTEN_ADDRESS", ":8081")
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log.Printf("Listening at %s", listenAddress)
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log.Fatalf("Failed to start http server: %v", http.ListenAndServe(listenAddress, nil))
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}
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func getenv(name string, fallback string) (value string) {
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value = os.Getenv(name)
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if value == "" {
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return fallback
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}
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return
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}
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func getSetting(name, fallback string) (value string) {
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return getenv("BANG_EVALUATOR_"+name, fallback)
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}
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func buildSearchURL(template string, query string) (searchUrl string) {
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searchUrl = strings.Replace(template, "%s", url.QueryEscape(query), 1)
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searchUrl = strings.Replace(searchUrl, "%S", query, 1)
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return searchUrl
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}
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func parseBang(searchQuery string) (bang string, query string) {
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regexStartBang, _ := regexp.Compile("\\!(.*) (.*)")
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regexEndBang, _ := regexp.Compile("(.*) \\!(.*)")
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startBang := regexStartBang.FindSubmatch([]byte(searchQuery))
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endBang := regexEndBang.FindSubmatch([]byte(searchQuery))
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if len(endBang) == 3 {
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bang = strings.ToLower(string(endBang[2]))
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query = string(endBang[1])
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return
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} else if len(startBang) == 3 {
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bang = strings.ToLower(string(startBang[1]))
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query = string(startBang[2])
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return
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} else {
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return "", searchQuery
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}
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}
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func evaluateBang(searchQuery string, searchEngine string) (query string, engine string) {
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bang, query := parseBang(searchQuery)
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engine = getBang(bang)
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if bang == "" || engine == "" {
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return searchQuery, searchEngine
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} else {
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return query, engine
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}
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}
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