Merge pull request #40 from qvalentin/feature/annotations

annotations support

annotations.go

@@ -0,0 +1,127 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"regexp"
+	"strings"
+
+	"github.com/gorilla/mux"
+)
+
+type annotationsResponse struct {
+	Response struct {
+		Referent struct {
+			Annotations []struct {
+				Body struct {
+					Html string `json:"html"`
+				} `json:"body"`
+			} `json:"annotations"`
+		} `json:"referent"`
+	} `json:"response"`
+}
+
+func annotationsHandler(w http.ResponseWriter, r *http.Request) {
+	id := mux.Vars(r)["id"]
+
+	if data, err := getCache(id); err == nil {
+
+		response, err := json.Marshal(data)
+
+		if err != nil {
+			logger.Errorf("could not marshal json: %s\n", err)
+			w.WriteHeader(http.StatusInternalServerError)
+			render("error", w, map[string]string{
+				"Status": "500",
+				"Error":  "Could not parse genius api response",
+			})
+			return
+		}
+		w.Header().Set("content-type", "application/json")
+		_, err = w.Write(response)
+		if err != nil {
+			logger.Errorln("Error sending response: ", err)
+		}
+		return
+	}
+
+	url := fmt.Sprintf("https://genius.com/api/referents/%s?text_format=html", id)
+	resp, err := sendRequest(url)
+
+	if err != nil {
+		logger.Errorln(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		render("error", w, map[string]string{
+			"Status": "500",
+			"Error":  "cannot reach genius servers",
+		})
+		return
+	}
+
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusNotFound {
+		w.WriteHeader(http.StatusNotFound)
+		render("error", w, map[string]string{
+			"Status": "404",
+			"Error":  "page not found",
+		})
+		return
+	}
+
+	buf := new(bytes.Buffer)
+	_, err = buf.ReadFrom(resp.Body)
+	if err != nil {
+		logger.Errorln("Error paring genius api response", err)
+		w.WriteHeader(http.StatusInternalServerError)
+		render("error", w, map[string]string{
+			"Status": "500",
+			"Error":  "Parsing error",
+		})
+		return
+	}
+
+	var data annotationsResponse
+	err = json.Unmarshal(buf.Bytes(), &data)
+	if err != nil {
+		logger.Errorf("could not unmarshal json: %s\n", err)
+		w.WriteHeader(http.StatusInternalServerError)
+		render("error", w, map[string]string{
+			"Status": "500",
+			"Error":  "Could not parse genius api response",
+		})
+		return
+	}
+
+	w.Header().Set("content-type", "application/json")
+	body := data.Response.Referent.Annotations[0].Body
+	body.Html = cleanBody(body.Html)
+	response, err := json.Marshal(body)
+
+	if err != nil {
+		logger.Errorf("could not marshal json: %s\n", err)
+		w.WriteHeader(http.StatusInternalServerError)
+		render("error", w, map[string]string{
+			"Status": "500",
+			"Error":  "Could not parse genius api response",
+		})
+		return
+	}
+
+	setCache(id, body)
+	_, err = w.Write(response)
+	if err != nil {
+		logger.Errorln("Error sending response: ", err)
+	}
+}
+
+func cleanBody(body string) string {
+	var withCleanedImageLinks = strings.Replace(body, "https://images.rapgenius.com/", "/images/", -1)
+
+	var re = regexp.MustCompile(`https?:\/\/[a-z]*.?genius.com`)
+	var withCleanedLinks = re.ReplaceAllString(withCleanedImageLinks, "")
+
+	return withCleanedLinks
+}

main.go

@@ -29,6 +29,7 @@ func main() {
 	r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { render("home", w, nil) })
 	r.HandleFunc("/search", searchHandler).Methods("GET")
 	r.HandleFunc("/{id}-lyrics", lyricsHandler)
+	r.HandleFunc("/{id}/{artist-song}/{verse}/annotations", annotationsHandler)
 	r.HandleFunc("/images/{filename}.{ext}", proxyHandler)
 	r.PathPrefix("/static/").Handler(http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))
 	r.HandleFunc("/albums/{artist}/{albumName}", albumHandler)

static/script.js

@@ -14,6 +14,24 @@ document.querySelectorAll("#lyrics a").forEach(item => {
 
 function getAnnotation(e) {
 	e.preventDefault()
-	//const uri = e.target.parentElement.getAttribute("href")
-	console.log("Annotations are not yet implemented!")
+	const uri = e.target.parentElement.getAttribute("href")
+	const presentAnnotation = document.getElementById(uri)
+	if (presentAnnotation) {
+		presentAnnotation.remove()
+		return
+	}
+
+	xhr = new XMLHttpRequest()
+	xhr.open("GET", uri + "/annotations")
+	xhr.send()
+	xhr.onreadystatechange = function() {
+		if (this.readyState == 4 && this.status == 200) {
+			const parsedReponse = JSON.parse(this.responseText)
+			const annotationDiv = document.createElement('div');
+			annotationDiv.innerHTML = parsedReponse.html
+			annotationDiv.id = uri
+			annotationDiv.className = "annotation"
+			e.target.parentElement.insertAdjacentElement('afterend', annotationDiv)
+		}
+	}
 }

static/style.css

@@ -56,8 +56,7 @@ body {
 	cursor: initial;
 }
 
-/*** NOT YET IMPLEMENTED
-#lyrics a {
+#lyrics a, .annotation {
 	background-color: #ddd;
 	color: inherit;
 }
@@ -65,7 +64,6 @@ body {
 #lyrics a:hover {
 	background-color: #ccc;
 }
-***/
 
 nav {
 	background-color: #ffcd38;
@@ -166,6 +164,19 @@ a {
 	cursor: pointer;
 }
 
+.annotation {
+  padding: 1rem;
+}
+
+.annotation img {
+  max-width: 100%;
+  height: auto;
+}
+
+.annotation ul {
+  padding-left: 1em;
+}
+
 .hidden {
 	display: none;
 }
@@ -337,6 +348,16 @@ footer a:hover {
 		color: #ccc;
 	}
 
+	#lyrics a, .annotation {
+		background-color: #272d44;
+		color: inherit;
+	}
+
+
+	#lyrics a:hover {
+		background-color: #32384f;
+	}
+
 	#metadata h1 {
 		color: #ddd;
 	}