GoLang
From Code Trash
OCR in Golang Version 2
//go get -u cloud.google.com/go/vision/apiv1
//check the imagefromuri in google vision apiv1
//set GOOGLE_APPLICATION_CREDENTIALS=C:\dev\go\jach-ocr-gcp-be4a172c9cda.json
package main
import (
"fmt"
"net"
"os"
"bytes"
"time"
"strings"
"regexp"
"strconv"
"encoding/base64"
"encoding/json"
"image"
_ "image/jpeg"
_ "image/png"
"image/jpeg"
"context"
"reflect"
vision "cloud.google.com/go/vision/apiv1"
)
const cHost = "127.0.0.1"
const cPort = "8080"
const cType = "tcp"
const tFilename = "captcha-image-temp.jpg";
func main() {
fmt.Println("\nStarting server ...")
con, err := net.Listen(cType, cHost+":"+cPort)
if err != nil {
fmt.Println("Unable to listen " + err.Error())
os.Exit(1)
}
defer con.Close()
for {
fmt.Println("Waiting for incoming connection ...");
c, err := con.Accept()
if err != nil {
fmt.Println("Error accepting incoming connection: ", err.Error());
return;
}
fmt.Println("Client connected: " + c.RemoteAddr().String());
readit(c);
}
}
const BSIZE = 1024;
func readit(con net.Conn) {
tbuff := make([]byte, BSIZE);
var buff []byte;
var tBytes uint32 = 0;
for {
nBytes, err := con.Read(tbuff);
if err != nil {
fmt.Println("ERR: " + err.Error());
con.Close();
return;
}
tBytes += uint32(nBytes);
if(nBytes < BSIZE) {
tbuff = tbuff[0:nBytes];
buff = append(buff, tbuff...);
break;
} else {
buff = append(buff, tbuff...);
}
}
rstr := prossit(buff);
con.Write([]byte(rstr));
con.Close();
}
func prossit(buff []byte) (string){
rstr := "";
fmt.Println("Request:::::::::::::::\n", string(buff[:]));
newline := bytes.LastIndex(buff, []byte("\r\n\r\n"));
newline += 4;
header := string(buff[:newline]);
if(strings.HasPrefix(string(header), "OPTIONS")) {
rstr = "HTTP/1.1 204 No Content\r\n" +
"Date: " + time.Now().Format(time.RFC1123) + "\r\n" +
"Server: Apache/2.0.61 (Unix)\r\n" +
"Access-Control-Allow-Origin: *\r\n" +
"Access-Control-Allow-Methods: POST, GET, OPTIONS\r\n" +
"Access-Control-Allow-Headers: Content-Type\r\n" +
"Connection: Close\r\n\r\n";
} else {
re := regexp.MustCompile("Content-Length: (?P<digit>[0-9]+)");
match := re.FindStringSubmatch(header);
fmt.Println(match);
if len(match) > 1 {
conlen, err := strconv.Atoi(match[1]);
if err != nil {
fmt.Println(err.Error());
return "";
}
fmt.Println(conlen);
} else {
fmt.Println("Match did not return 2");
fmt.Println(match);
return "";
}
ret := writeit(buff[newline:])
if(ret != "") {
keyv := make(map[string]string);
keyv["convtext"] = ret;
jsons, _ := json.Marshal(keyv);
ret = string(jsons);
} else {
ret = "Unable to process. Try again later";
}
rstr = "HTTP/1.1 200 OK\r\n" +
"Content-Length: " + strconv.Itoa(len(ret)) + "\r\n" +
"Content-Type: plain/text\r\n" +
"Access-Control-Allow-Origin: *\r\n" +
"Connection: Close\r\n\r\n" + ret;
}
fmt.Println("Response string is:", rstr);
return rstr;
}
func writeit(buff []byte) string {
suff := bytes.Index(buff, []byte(";base64"));
fmt.Println("suff is : ", suff);
if(suff < 0) {
fmt.Println("Invalid post data");
return "";
}
nbuff := string(buff[23:]);
ret := "";
switch string(buff[5:suff]) {
case "image/jpeg":
reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(nbuff));
img, dim, err := image.Decode(reader);
if err != nil {
fmt.Println(err);
} else {
fmt.Println("success", reflect.TypeOf(img), dim);
fp, err := os.OpenFile(tFilename, os.O_WRONLY|os.O_CREATE, 0777);
if(err == nil) {
jpeg.Encode(fp, img, nil);
fp.Close();
ret = visionapi(tFilename);
}
}
break;
case "image/png":
fmt.Println("PNG: Not implemented");
break;
default:
fmt.Println("Invalid image type");
}
return ret;
}
func visionapi(filename string) string {
ctx := context.Background()
defer func() string {
if err:= recover(); err != nil {
fmt.Println(err);
}
return "";
}();
// Creates a client.
client, err := vision.NewImageAnnotatorClient(ctx)
if err != nil {
panic("Failed to create client: " + err.Error())
}
defer client.Close()
file, err := os.Open(filename)
if err != nil {
panic("Failed to open file: " + filename + " - " + err.Error());
}
image, err := vision.NewImageFromReader(file);
if err != nil {
panic("Failed to create image from file: " + err.Error());
}
text, err := client.DetectTexts(ctx, image, nil, 10)
if err != nil {
panic("Failed to detect text: " + err.Error())
}
txt := strings.TrimSuffix(text[0].Description, "\n");
fmt.Println("Text is: " + txt);
return txt;
}
OCR golang Version 1
//go get -u cloud.google.com/go/vision/apiv1
//check the imagefromuri in google vision apiv1
package main
import (
"fmt"
"net"
"os"
"bytes"
"time"
"strings"
"regexp"
"strconv"
"encoding/base64"
"image"
_ "image/jpeg"
_ "image/png"
"image/jpeg"
"context"
"reflect"
vision "cloud.google.com/go/vision/apiv1"
)
const cHost = "127.0.0.1"
const cPort = "8080"
const cType = "tcp"
func main() {
fmt.Println("\nStarting server ...")
con, err := net.Listen(cType, cHost+":"+cPort)
if err != nil {
fmt.Println("Unable to listen " + err.Error())
os.Exit(1)
}
defer con.Close()
for {
fmt.Println("Waiting for incoming connection ...");
c, err := con.Accept()
if err != nil {
fmt.Println("Error accepting incoming connection: ", err.Error());
return;
}
fmt.Println("Client connected: " + c.RemoteAddr().String());
readit(c);
}
}
const BSIZE = 1024;
func readit(con net.Conn) {
tbuff := make([]byte, BSIZE);
var buff []byte;
var tBytes uint32 = 0;
for {
nBytes, err := con.Read(tbuff);
if err != nil {
fmt.Println("ERR: " + err.Error());
con.Close();
return;
}
tBytes += uint32(nBytes);
if(nBytes < BSIZE) {
tbuff = tbuff[0:nBytes];
buff = append(buff, tbuff...);
break;
} else {
buff = append(buff, tbuff...);
}
}
rstr := prossit(buff);
con.Write([]byte(rstr));
con.Close();
}
func prossit(buff []byte) (string){
rstr := "";
newline := bytes.LastIndex(buff, []byte("\r\n\r\n"));
newline += 4;
header := string(buff[:newline]);
if(strings.HasPrefix(string(header), "OPTIONS")) {
rstr = "HTTP/1.1 204 No Content\r\n" +
"Date: " + time.Now().Format(time.RFC1123) + "\r\n" +
"Server: Apache/2.0.61 (Unix)\r\n" +
"Access-Control-Allow-Origin: *\r\n" +
"Access-Control-Allow-Methods: POST, GET, OPTIONS\r\n" +
"Access-Control-Allow-Headers: Content-Type\r\n" +
"Connection: Close\r\n\r\n";
} else {
re := regexp.MustCompile("Content-Length: (?P<digit>[0-9]+)");
match := re.FindStringSubmatch(header);
fmt.Println(match);
if len(match) > 1 {
conlen, err := strconv.Atoi(match[1]);
if err != nil {
fmt.Println(err.Error());
return "";
}
fmt.Println(conlen);
} else {
fmt.Println("Match did not return 2");
fmt.Println(match);
return "";
}
writeit(buff[newline:])
rstr = "HTTP/1.1 200 OK\r\n" +
"Content-Length: 5\r\n" +
"Content-Type: plain/text\r\n" +
"Access-Control-Allow-Origin: *\r\n" +
"Connection: Close\r\n\r\n" +
"Hello";
}
return rstr;
}
func writeit(buff []byte) {
suff := bytes.Index(buff, []byte(";base64"));
nbuff := string(buff[23:]);
switch string(buff[5:suff]) {
case "image/jpeg":
reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(nbuff));
img, dim, err := image.Decode(reader);
if err != nil {
fmt.Println(err);
} else {
fmt.Println("success", reflect.TypeOf(img), dim);
fp, err := os.OpenFile("chitta-temp.jpg", os.O_WRONLY|os.O_CREATE, 0777);
if(err == nil) {
jpeg.Encode(fp, img, nil);
fp.Close();
visionapi("chitta-temp.jpg");
}
}
break;
case "image/png":
fmt.Println("png");
break;
default:
fmt.Println("invalid");
}
}
func visionapi(filename string) {
ctx := context.Background()
// Creates a client.
client, err := vision.NewImageAnnotatorClient(ctx)
if err != nil {
fmt.Println("Failed to create client: ", err)
return;
}
defer client.Close()
file, err := os.Open(filename)
if err != nil {
fmt.Println("Failed to open file: ", filename);
return;
}
image, err := vision.NewImageFromReader(file);
if err != nil {
fmt.Println("Faied to create image from file: ", err);
return;
}
text, err := client.DetectTexts(ctx, image, nil, 10)
if err != nil {
fmt.Println("Failed to detect text: ", err)
return;
}
fmt.Println("Test is : ",text);
}
Content script
document.body.style.border = "2px solid red";
/*
var sam = document.getElementsByName('districtCode')[0];
for(var i=0; i<sam.options.length; i++)
if(sam.options[i].text.toLowerCase().lastIndexOf('namakkal') + 1)
alert(i);
*/
function getDataUrl(img) {
// Create canvas
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
// Set width and height
canvas.width = 280;
canvas.height = 70;
// Draw the image
ctx.drawImage(img, 0, 0);
return canvas.toDataURL('image/jpeg');
}
function pageone() {
document.getElementsByName('districtCode')[0].selectedIndex = 17;
document.getElementsByName('areaType')[0].checked = true;
document.forms['checkForm'].submit();
}
function pagetwo() {
document.getElementsByName('talukCode')[0].selectedIndex = 5;
document.getElementsByName('talukCode')[0].onchange();
//window.getVillages(document.forms[0].districtCode.value,'02')
window.setTimeout(function() {
document.getElementsByName('villageCode')[0].selectedIndex = 50;
document.getElementsByName('viewOpt')[1].click();
document.getElementsByName('viewOption')[1].click();
}, 1000)
}
if(document.getElementById('areaType')) {
pageone();
}
if(document.getElementsByName('villageCode').length) {
pagetwo();
var imgobj = document.getElementById('captchaImg');
console.log(imgobj);
imgobj.addEventListener('load', function() {
var url = getDataUrl(imgobj);
var jax = new XMLHttpRequest();
jax.open('POST', 'http://localhost:8080/');
jax.setRequestHeader('Content-Type', 'text/plain');
jax.send(url);
jax.onreadystatechange = function() {
if(jax.readyState == 4) {
try {
var obj = JSON.parse(jax.responseText);
if(obj.convtext)
document.getElementsByName('captcha')[0].value = obj.convtext;
console.log(jax.responseText);
}catch(e) {
console.log(e);
}
}
}
}, false)
}
/*
function getDataUrl(img) {
// Create canvas
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
// Set width and height
canvas.width = img.width;
canvas.height = img.height;
// Draw the image
ctx.drawImage(img, 0, 0);
return canvas.toDataURL('image/jpeg');
}
function selo() {
var jax = new XMLHttpRequest();
jax.open('post', 'http://localhost:8080/', false);
jax.setRequestHeader('Content-Type', 'text/plain');
jax.send(url);
console.log(jax.responseText);
console.log(JSON.parse(str));
}
var imgobj = document.getElementById('captchaImg');
var url = getDataUrl(imgobj);
var imgobj = document.getElementsByTagName('img')[0];
var url = getDataUrl(imgobj);
*/
Manifest
{
"manifest_version": 2,
"name": "Chitta Injection",
"version": "1.0",
"description": "Chitta injection.",
"icons": {
"48": "dogicon.png",
"96": "dogicon.png"
},
"content_scripts": [
{
"matches": ["*://*.eservices.tn.gov.in/eservicesnew/land/*"],
"js": ["cs.js"],
"run_at": "document_end"
}
],
"permissions": [
"http://*/"
],
"browser_action": {
"browser_style": true,
"default_icon": {
"16": "dogicon.png",
"32": "dogicon.png"
}
},
"background": {
"scripts": ["background.js"]
}
}
