Add search endpoint

app.go

@@ -41,6 +41,7 @@ func NewDatetime() (*Datetime, error) {
 	mux.Handle("/js/", http.FileServer(http.Dir("assets")))
 	mux.Handle("/css/", http.FileServer(http.Dir("assets")))
 	mux.Handle("/favicon.ico", http.FileServer(http.Dir("assets")))
+	mux.HandleFunc("/search", app.search)
 	mux.HandleFunc("/", app.index)
 
 	return app, nil
@@ -51,6 +52,11 @@ type appRequest struct {
 	Req Request
 }
 
+type appSearch struct {
+	App Datetime
+	Req map[string]string
+}
+
 // index handles all incoming page requests
 func (app Datetime) index(w http.ResponseWriter, req *http.Request) {
 	var err error
@@ -86,3 +92,34 @@ func (app Datetime) index(w http.ResponseWriter, req *http.Request) {
 		return
 	}
 }
+
+// search handles zone search queries
+func (app Datetime) search(w http.ResponseWriter, req *http.Request) {
+	var err error
+
+	if req.Method != http.MethodGet && req.Method != http.MethodHead {
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		return
+	}
+
+	tmpl := app.loadTemplate("search", w, req)
+	if tmpl == nil {
+		return
+	}
+	if req.Method == http.MethodHead {
+		return
+	}
+
+	// TODO: do search
+	search := map[string]string{
+		"hi": "hello",
+	}
+
+	l.Debug("rendering template", zap.Reflect("search", search))
+	err = tmpl.Execute(w, appSearch{app, search})
+	if err != nil {
+		l.Error("templating failed", zap.Error(err))
+		app.templateError(HTTPError{http.StatusInternalServerError, err}, w, req)
+		return
+	}
+}

mime.go

@@ -57,6 +57,7 @@ type responseType int
 const (
 	responsePlain   responseType = iota
 	responseHTML    responseType = iota
+	responseJSON    responseType = iota
 	responseAny     responseType = iota
 	responseUnknown responseType = iota
 )
@@ -64,6 +65,7 @@ const (
 const (
 	responsePlainMime = "text/plain"
 	responseHTMLMime  = "text/html"
+	responseJSONMime  = "application/json"
 	responseAnyMime   = "*/*"
 )
 
@@ -77,6 +79,9 @@ func chooseResponseType(accept string) responseType {
 		if m.media == responseHTMLMime {
 			return responseHTML
 		}
+		if m.media == responseJSONMime {
+			return responseJSON
+		}
 		if m.media == responseAnyMime {
 			return responseAny
 		}

template.go

@@ -1,12 +1,18 @@
 package main
 
 import (
+	"errors"
+	"fmt"
 	"html/template"
 	"net/http"
 
 	"go.uber.org/zap"
 )
 
+// ErrTemplateNotFound is thrown when a template with the requested MIME type
+// is not found.
+var ErrTemplateNotFound = errors.New("unable to find template")
+
 // loadTemplate returns a matching template for the request. It also causes an
 // error if the template is not found or the Accept parameters are incorrect.
 func (app Datetime) loadTemplate(name string, w http.ResponseWriter, req *http.Request) *template.Template {
@@ -17,8 +23,10 @@ func (app Datetime) loadTemplate(name string, w http.ResponseWriter, req *http.R
 		return nil
 	}
 	if tmpl == nil {
-		l.Error("unable to find template", zap.String("name", name), zap.String("accept", accept))
-		app.simpleError(HTTPError{http.StatusInternalServerError, ErrNoTemplate}, w, req)
+		err := fmt.Errorf("%w \"%s\" for \"%s\"", ErrTemplateNotFound, name, accept)
+		l.Warn("unable to find template", zap.Error(err), zap.String("name", name), zap.String("accept", accept))
+		app.simpleError(HTTPError{http.StatusNotAcceptable, err}, w, req)
+		//app.simpleError(HTTPError{http.StatusInternalServerError, ErrNoTemplate}, w, req)
 		return nil
 	}
 	w.Header().Set("Content-Type", contentType)
@@ -36,6 +44,9 @@ func (app Datetime) chooseTemplate(accept string, name string) (t *template.Temp
 	case responseHTML:
 		t = app.tmpl.Lookup(name + ".html")
 		contentType = "text/html"
+	case responseJSON:
+		t = app.tmpl.Lookup(name + ".json")
+		contentType = "application/json"
 	case responseAny:
 		t = app.tmpl.Lookup(name + ".txt")
 		contentType = "text/plain"

templatehelpers.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"html/template"
 	"net/http"
 
@@ -10,6 +11,8 @@ import (
 var templateFuncs = map[string]interface{}{
 	"statusText": templateFuncStatusText,
 	"thisIsSafe": templateFuncThisIsSafe,
+	// Encoding
+	"jsonMarshal": templateFuncJSONMarshal,
 	// Formatting
 	"formatOffset": templateFuncFormatOffset,
 	// Logic
@@ -23,6 +26,14 @@ func templateFuncThisIsSafe(s string) template.HTML {
 	return template.HTML(s)
 }
 
+func templateFuncJSONMarshal(v interface{}) string {
+	b, err := json.Marshal(v)
+	if err != nil {
+		return ""
+	}
+	return string(b)
+}
+
 func templateFuncFormatOffset(offset int) string {
 	return FormatZoneOffset(offset)
 }

templates/index.html

@@ -53,7 +53,9 @@
 
 	{{template "interactive-icons.html"}}
 
+	<!--
 	<script src="/js/third-party/luxon.min.js"></script>
 	<script src="/js/interactive.js" async></script>
+	-->
 </body>
 </html>

templates/search.json

@@ -0,0 +1 @@
+{{.Req | jsonMarshal | thisIsSafe }}