IndianGuru · September 22, 2015 05:08
diff --git a/geowebgap.go b/geowebgap.go
 package geowebgap

 import (
 	"encoding/json"
 	"fmt"
 	"html/template"
 	"log"
 	"net/http"
 	"net/url"

 	"appengine"
        "appengine/urlfetch"
 )

 type Response struct {
 	Results []struct {
 		Geometry struct {
 			Location struct {
 				Lat float64
 				Lng float64
 			}
 		}
 	}
 }

 func init() {
        http.HandleFunc("/", handler)
        http.HandleFunc("/showimage", showimage)
 }

 func handler(w http.ResponseWriter, r *http.Request) {
        fmt.Fprint(w, rootForm)
 }

 const rootForm = `
  <!DOCTYPE html>
    <html>
      <head>
        <meta charset="utf-8">
        <title>Accept Address</title>
      </head>
      <body>
        <h1>Accept Address</h1>
        <p>Please enter your address:</p>
        <form action="/showimage" method="post" accept-charset="utf-8">
 	  <input type="text" name="str" value="Type address..." id="str">
 	  <input type="submit" value=".. and see the image!">
        </form>
      </body>
    </html>
 `

 func check(e error, str string) {
 	if e != nil {
 		log.Fatal(str, " ", e)
 		return
 	}
 }

 var upperTemplate = template.Must(template.New("showimage").Parse(upperTemplateHTML))

 func showimage(w http.ResponseWriter, r *http.Request) {
        // Sample address "1600 Amphitheatre Parkway, Mountain View, CA"
        addr := r.FormValue("str")

 	// QueryEscape escapes the addr string so
 	// it can be safely placed inside a URL query
        safeAddr := url.QueryEscape(addr)

        // Geocoding API
        fullUrl := fmt.Sprintf("http://maps.googleapis.com/maps/api/geocode/json?address=%s", safeAddr)

        // One needs an appengine.Context to interact with external 
        // services, including email and urlfetch.
        c := appengine.NewContext(r)

        // Function Client returns an *http.Client
        client := urlfetch.Client(c)
        
        resp, err := client.Get(fullUrl)
        check(err, "Get:")
        
 	// Callers should close resp.Body
 	// when done reading from it
 	// Defer the closing of the body
 	defer resp.Body.Close()

        var res Response

        // We generate the latitude and longitude using "The Google Geocoding API".
        // Geocoding is the process of converting an address (like 
        // "1600 Amphitheatre Parkway, Mountain View, CA") into its geographic
        // coordinates (like latitude 37.423021 and longitude -122.083739).
        // Use json.Decode or json.Encode for reading or writing streams of JSON data
 	if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
 		log.Println(err)
 	}

 	// lat, lng as float64
 	lat := res.Results[0].Geometry.Location.Lat
 	lng := res.Results[0].Geometry.Location.Lng        

        //safeLatLng := url.QueryEscape(fmt.Sprintf("%.13f,%.13f", lat, lng))

        // %.13f is used to convert float64 to a string
 	queryUrl := fmt.Sprintf("http://maps.googleapis.com/maps/api/streetview?size=600x300&location=%.13f,%.13f", lat, lng)
 	
 	tempErr := upperTemplate.Execute(w, queryUrl)
 	check(tempErr, "Execute:")
 }

 const upperTemplateHTML = ` 
 <!DOCTYPE html>
  <html>
    <head>
      <meta charset="utf-8">
      <title>Display Image</title>
    </head>
    <body>
      <h3>Image at your Address</h3>
      <img src="{{html .}}" alt="Image" />
    </body>
  </html>
 `
	package geowebgap

	import (
	"encoding/json"
	"fmt"
	"html/template"
	"log"
	"net/http"
	"net/url"

	"appengine"
	"appengine/urlfetch"
	)

	type Response struct {
	Results []struct {
	Geometry struct {
	Location struct {
	Lat float64
	Lng float64
	}
	}
	}
	}

	func init() {
	http.HandleFunc("/", handler)
	http.HandleFunc("/showimage", showimage)
	}

	func handler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprint(w, rootForm)
	}

	const rootForm = `
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Accept Address</title>
	</head>
	<body>
	<h1>Accept Address</h1>
	<p>Please enter your address:</p>
	<form action="/showimage" method="post" accept-charset="utf-8">
	<input type="text" name="str" value="Type address..." id="str">
	<input type="submit" value=".. and see the image!">
	</form>
	</body>
	</html>
	`

	func check(e error, str string) {
	if e != nil {
	log.Fatal(str, " ", e)
	return
	}
	}

	var upperTemplate = template.Must(template.New("showimage").Parse(upperTemplateHTML))

	func showimage(w http.ResponseWriter, r *http.Request) {
	// Sample address "1600 Amphitheatre Parkway, Mountain View, CA"
	addr := r.FormValue("str")

	// QueryEscape escapes the addr string so
	// it can be safely placed inside a URL query
	safeAddr := url.QueryEscape(addr)

	// Geocoding API
	fullUrl := fmt.Sprintf("http://maps.googleapis.com/maps/api/geocode/json?address=%s", safeAddr)

	// One needs an appengine.Context to interact with external
	// services, including email and urlfetch.
	c := appengine.NewContext(r)

	// Function Client returns an *http.Client
	client := urlfetch.Client(c)

	resp, err := client.Get(fullUrl)
	check(err, "Get:")

	// Callers should close resp.Body
	// when done reading from it
	// Defer the closing of the body
	defer resp.Body.Close()

	var res Response

	// We generate the latitude and longitude using "The Google Geocoding API".
	// Geocoding is the process of converting an address (like
	// "1600 Amphitheatre Parkway, Mountain View, CA") into its geographic
	// coordinates (like latitude 37.423021 and longitude -122.083739).
	// Use json.Decode or json.Encode for reading or writing streams of JSON data
	if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
	log.Println(err)
	}

	// lat, lng as float64
	lat := res.Results[0].Geometry.Location.Lat
	lng := res.Results[0].Geometry.Location.Lng

	//safeLatLng := url.QueryEscape(fmt.Sprintf("%.13f,%.13f", lat, lng))

	// %.13f is used to convert float64 to a string
	queryUrl := fmt.Sprintf("http://maps.googleapis.com/maps/api/streetview?size=600x300&location=%.13f,%.13f", lat, lng)

	tempErr := upperTemplate.Execute(w, queryUrl)
	check(tempErr, "Execute:")
	}

	const upperTemplateHTML = `
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Display Image</title>
	</head>
	<body>
	<h3>Image at your Address</h3>
	<img src="{{html .}}" alt="Image" />
	</body>
	</html>
	`
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