How can I display the contacts images along with the numbers as like the contact list from the device.I tried to display the image from URL "content://com.android.contacts/contacts/" by using the 'Contacts Plugin'.But I can't fetch the image from that URL.The type of image is set as 'External URL'.
I was facing the same issue but resolved it now
I have used below javascript and you must have FilePlugin as dependency for your module.
window.resolveLocalFileSystemURL($parameters.ContactPhotoURI, onResolveSuccess, onResolveFail);
function onResolveSuccess(fileEntry) {
fileEntry.file(function (file) {
var reader = new FileReader();
reader.onloadend = function(evt) {
// Remove the data:image/jpeg, part of the returned value
$parameters.ContactPhoto = evt.target.result.substring(evt.target.result.indexOf(',') + 1);
$resolve();
};
reader.readAsDataURL(file);
}, onErrorReadFile);
}
function onResolveFail(error) {
console.log("Error resolving Local File System URL " + JSON.stringify(error));
$resolve();
}
function onErrorReadFile(error){
console.log("ERRO!");
console.log(error);
$resolve();
}
Here ContantPhotoURI is the uri returned by ContactPlugin and ContactPhoto is binary data which can be loaded into Image.
If there is any doubt you can follow the discussion here
Related
My model is held in a JavaScript object on the client side, where the user can edit its properties via the UI controls. I want to offer the user an option to download a JSON file representing the model they're editing. I'm using MVC core with .net 6.
What I've tried
Action method (using Newtonsoft.Json to serialize the model to JSON):
public IActionResult Download([FromForm]SomeModel someModel)
{
var json = JsonConvert.SerializeObject(someModel);
var characters = json.ToCharArray();
var bytes = new byte[characters.Length];
for (var i = 0; i < characters.Length; i++)
{
bytes[i] = (byte)characters[i];
}
var stream = new MemoryStream();
stream.Write(bytes);
stream.Position = 0;
return this.File(stream, "APPLICATION/octet-stream", "someFile.json");
}
Code in the view to call this method:
<button class="btn btn-primary" onclick="download()">Download</button>
And the event handler for this button (using jQuery's ajax magic):
function download() {
$.ajax({
url: 'https://hostname/ControllerName/Download',
method: 'POST',
data: { someModel: someModel },
success: function (data) {
console.log('downloading', data);
},
});
}
What happened
The browser console shows that my model has been posted to the server, serialized to JSON and the JSON has been returned to the browser. However no file is downloaded.
Something else I tried
I also tried a link like this to call the action method:
#Html.ActionLink("Download", "Download", "ControllerName")
What happened
This time a file was downloaded, however, because ActionLink can only make GET requests, which have no request body, the user's model isn't passed to the server and instead the file which is downloaded represents a default instance of SomeModel.
The ask
So I know I can post my model to the server, serialize it to JSON and return that JSON to the client, and I know I can get the browser to download a JSON-serialized version of a model, but how can I do both in the same request?
Edit: What I've done with the answer
I've accepted Xinran Shen's answer, because it works as-is, but because I believe that just copying code from Stack Overflow without understanding what it does or why isn't good practice, I did a bit of digging and my version of the saveData function now looks like this:
function saveData(data, fileName) {
// Convert the data to a JSON string and store it in a blob, a file-like
// object which can be downloaded without it existing on the server.
// See https://developer.mozilla.org/en-US/docs/Web/API/Blob
var json = JSON.stringify(data);
var blob = new Blob([json], { type: "octet/stream" });
// Create a URL from which the blob can be downloaded - see
// https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL
var url = window.URL.createObjectURL(blob);
// Add a hidden hyperlink to the page, which will download the file when clicked
var a = document.createElement("a");
a.style = "display: none";
a.href = url;
a.download = fileName;
document.body.appendChild(a);
// Trigger the click event on the hyperlink to download the file
a.click();
// Release the blob's URL.
// Browsers do this when the page is unloaded, but it's good practice to
// do so as soon as it's no longer needed.
window.URL.revokeObjectURL(url);
// Remove the hidden hyperlink from the page
a.remove();
}
Hope someone finds this useful
First, Your code is right, You can try to access this method without ajax, You will find it can download file successfully,But You can't use ajax to achieve this, because JavaScript cannot interact with disk, you need to use Blob to save the file. change your javascript like this:
function download() {
$.ajax({
url: 'https://hostname/ControllerName/Download',
method: 'Post',
data: { someModel: someModel },,
success: function (data) {
fileName = "my-download.json";
saveData(data,fileName)
},
});
}
var saveData = (function () {
var a = document.createElement("a");
document.body.appendChild(a);
a.style = "display: none";
return function (data, fileName) {
var json = JSON.stringify(data),
blob = new Blob([json], {type: "octet/stream"}),
url = window.URL.createObjectURL(blob);
a.href = url;
a.download = fileName;
a.click();
window.URL.revokeObjectURL(url);
};
}());
I think you may need FileStreamResult, also you need to set the MIME type to text file or json file.
// instead of this
return this.File(stream, "APPLICATION/octet-stream", "someFile.json");
// try this
return new FileStreamResult(stream, new MediaTypeHeaderValue("text/plain"))
{
FileDownloadName = "someFile.txt"
};
// or
return new FileStreamResult(stream, new MediaTypeHeaderValue("application/json"))
{
FileDownloadName = "someFile.json"
};
Reference: https://www.c-sharpcorner.com/article/fileresult-in-asp-net-core-mvc2/
I created a script that extracts photos in the gallery of a certain profile…
Using instagram-web-api
Unfortunately now it no longer works, instagram does not return the image of the media
This is the mistake:
ERR_BLOCKED_BY_RESPONSE
Instagram has changed it’s CORS policy recently? How I can fix?
for php; I changed my img src to this and it works like charm! Assume that $image is the instagram image cdn link came from instagram page:
'data:image/jpg;base64,'.base64_encode(file_get_contents($image))
EDIT FOR BETTER SOLUTION
I have also noticed that, this method is causing so much latency. So I have changed my approach and now using a proxy php file (also mentioned on somewhere on stackoverflow but I don't remember where it is)
This is my common proxy file content:
<?php
function ends_with( $haystack, $needle ) {
return substr($haystack, -strlen($needle))===$needle;
}
if (!in_array(ini_get('allow_url_fopen'), [1, 'on', 'true'])) {
die('PHP configuration change is required for image proxy: allow_url_fopen setting must be enabled!');
}
$url = isset($_GET['url']) ? $_GET['url'] : null;
if (!$url || substr($url, 0, 4) != 'http') {
die('Please, provide correct URL');
}
$parsed = parse_url($url);
if ((!ends_with($parsed['host'], 'cdninstagram.com') && !ends_with($parsed['host'], 'fbcdn.net')) || !ends_with($parsed['path'], 'jpg')) {
die('Please, provide correct URL');
}
// instagram only has jpeg images for now..
header("Content-type: image/jpeg");
readfile( $url );
?>
Then I have just converted all my instagram image links to this (also don't forget to use urlencode function on image links):
./proxyFile.php?url=https://www.....
It worked like charm and there is no latency anymore.
now 100% working.
You can try this.
corsDown
Using the Google translation vulnerability, it can display any image URL, with or without permission. All these processes are done by the visitor's IP and computer.
I have the same problem, when I try to load a Instagram's pictures url (I tried with 3 IP addresses), I see this on the console:
Failed to load resource: net::ERR_BLOCKED_BY_RESPONSE
You can see it here, the Instagram image doesn't load (Actually, when I paste this url on google it works, but Instagram puts a timestamp on there pictures so, it's possible it won't work for you).
It's very recent, 3 days ago, it works with no issues.
<img src="https://scontent-cdt1-1.cdninstagram.com/v/t51.2885-19/s320x320/176283370_363930668352575_6367243109377325650_n.jpg?tp=1&_nc_ht=scontent-cdt1-1.cdninstagram.com&_nc_ohc=nC7FG1NNChYAX8wSL7_&edm=ABfd0MgBAAAA&ccb=7-4&oh=696d56547f87894c64f26613c9e44369&oe=60AF5A34&_nc_sid=7bff83">
The answer is as follows. You can use the imgproxy.php file. You can do it like this:
echo '<a href="' . $item->link . '" class="image" target="_blank">
<span style="background-image:url(imgproxy.php?url=' . urlencode($thumbnail) . ');"> </span>
</a>';
Using PHP
u can grab content of the image and show it in php file as an image by setting the header:
<?php
$img_ctn = file_get_contents("https://scontent-ber1-1.cdninstagram.com/v/......");
header('Content-type: image/png');
echo $img_ctn;
You can display the Image using Base64 encoded.
Base64 func based on #abubakar-ahmad answer.
JavaScript:
export const checkUserNameAndImage = (userName) => {
/* CALL THE API */
return new Promise((resolve, reject) => {
fetch(`/instagram`, {
method: "POST",
headers: {
Accept: "application/json",
"Content-Type": "application/json",
},
body: JSON.stringify({ userName }),
})
.then(function (response) {
return response.text();
})
/* GET RES */
.then(function (data) {
const dataObject = JSON.parse(data);
/* CALL BASE64 FUCNTION */
toDataUrl(dataObject.pic, function (myBase64) {
/* INSERT TO THE OBEJECT BASE64 PROPERTY */
dataObject.picBase64 = myBase64;
/* RETURN THE OBJECT */
resolve(dataObject);
});
})
.catch(function (err) {
reject(err);
});
});
};
Base64 func:
function toDataUrl(url, callback) {
var xhr = new XMLHttpRequest();
xhr.onload = function () {
var reader = new FileReader();
reader.onloadend = function () {
callback(reader.result);
};
reader.readAsDataURL(xhr.response);
};
xhr.open("GET", url);
xhr.responseType = "blob";
xhr.send();
}
Now, instead of using the original URL, use the picBase64 property:
<image src={data.picBase64)}/>
I have built a simple PHP based media proxy to minimize copy&paste.
https://github.com/skmachine/instagram-php-scraper#media-proxy-solving-cors-issue-neterr_blocked_by_response
Create mediaproxy.php file in web server public folder and pass instagram image urls to it.
<?php
use InstagramScraper\MediaProxy;
// use allowedReferersRegex to restrict other websites hotlinking images from your website
$proxy = new MediaProxy(['allowedReferersRegex' => "/(yourwebsite\.com|anotherallowedwebsite\.com)$/"]);
$proxy->handle($_GET, $_SERVER);
I was too lazy to do the suggested solutions and since i had a nodejs server sending me urls i just wrote new functions to get the images, convered them to base64 and sent them to my frontend. Yes it's slower and heavier but it gets the job done for me since i don't have a huge need for performance.
Fetch and return base64 from url snippet
const getBase64Image = async (url) => {
return new Promise((resolve, reject) => {
// Safety net so the entire up
// doesn't fucking crash
if (!url) {
resolve(null);
}
https
.get(url, (resp) => {
resp.setEncoding("base64");
body = "data:" + resp.headers["content-type"] + ";base64,";
resp.on("data", (data) => {
body += data;
});
resp.on("end", () => {
resolve(body);
});
})
.on("error", (e) => {
reject(e.message);
});
});
};
You don't need any external modules for this.
I’m having a problem with image uploads with the Cloudinary API.
I have the app running on Heroku. I’m using Node for my backend. The app runs fine, until a user tries to post an image. I then get the following error message:
Invalid Signature ******************************. String to
sign - 'timestamp=.
I used the same setup in another app, and it works fine. I’ve followed some stack overflow threads on the problem, but I’m not getting a useful answer that I understand.
I’ve set up the environment variables in Heroku the same way I did on another app, and it works. I’ve also installed the Cloudinary and Multer packages in my package.json file.
Any ideas what I’m doing wrong here?
Below is my code:
var multer = require('multer');
var storage = multer.diskStorage({
filename: function(req, file, callback) {
callback(null, Date.now() + file.originalname);
}
});
var imageFilter = function (req, file, cb) {
// accept image files only
if (!file.originalname.match(/\.(jpg|jpeg|png|gif)$/i)) {
return cb(new Error('Only image files are allowed!'), false);
}
cb(null, true);
};
var upload = multer({ storage: storage, fileFilter: imageFilter});
var cloudinary = require('cloudinary');
cloudinary.config({
cloud_name: 'digi9mjbp',
api_key: process.env.CLOUDINARY_API_KEY,
api_secret: process.env.CLOUDINARY_API_SECRET
})
router.post("/", middleware.isLoggedIn, upload.single('image'),
function(req, res) {
cloudinary.v2.uploader.upload(req.file.path, function(err,result){
if(err){
req.flash("error", err.message);
return res.redirect("back");
}
// add cloudinary url for the image to the topic object under image
property
req.body.topic.image = result.secure_url;
//add image's public_id to topic object
req.body.topic.imageId = result.public_id;
// add author to topic
req.body.topic.author = {
id: req.user._id,
username: req.user.username
};
Topic.create(req.body.topic, function(err, topic){
if (err) {
req.flash('error', err.message);
return res.redirect('back');
}
res.redirect('/topics/' + topic.id);
});
});
});
How can I delete an image's file from the server using Parse Cloud Code. I am using back4app.com
After Deleting Image Row
I am getting the images urls, then calling a function to delete the image using its url
Parse.Cloud.afterDelete("Image", function(request) {
// get urls
var imageUrl = request.object.get("image").url();
var thumbUrl = request.object.get("thumb").url();
if(imageUrl!=null){
//delete
deleteFile(imageUrl);
}
if(thumbUrl!=null){
//delete
deleteFile(thumbUrl);
}
});
Delete the image file from the server
function deleteFile(url){
Parse.Cloud.httpRequest({
url: url.substring(url.lastIndexOf("/")+1),
method: 'DELETE',
headers: {
'X-Parse-Application-Id': 'xxx',
'X-Parse-Master-Key': 'xxx'
}
}).then(function(httpResponse) {
console.log(httpResponse.text);
}, function(httpResponse) {
console.error('Request failed with response code ' + httpResponse.status);
});
}
for security reasons, not is posible to delete directly the image from Back4App, using DELETE from SDK or REST API. I believe that you can follow the guide below:
https://help.back4app.com/hc/en-us/articles/360002327652-How-to-delete-files-completely-
After struggling with this for a while it seems to be possible through cloud function as mentioned here. One need to use MasterKey in the cloud code:
Parse.Cloud.define('deleteGalleryPicture', async (request) => {
const {image_id} = request.params;
const Gallery = Parse.Object.extend('Gallery');
const query = new Parse.Query(Gallery);
try {
const Image = await query.get(image_id);
const picture = Image.get('picture');
await picture.destroy({useMasterKey: true});
await Image.destroy();
return 'Image removed.';
} catch (error) {
console.log(error);
throw new Error('Error deleting image');
}
});
For me it was first confusing since I could open the link to that file even after I deleted the reference object in the dashboard, but then I found out that the dashboard is not calling Parse.Cloud.beforeDelete() trigger for some reason.
Trying to download the data from the url after deleting the file through the cloud code function returns 0kB data and therefore confirms that they were deleted.
I uploaded a raw String 'Test' to the firebase storage using the sample provided here and it went through successfully.
But when I tried to "download" the string I uploaded, using the sample below, apparently he only example on how to download data from firebase storage it returns the url of the string file.
storageRef.child('path/to/string').getDownloadURL().then(function(url) {
// I get the url of course
}).catch(function(error) {
// Handle any errors
});
How do I get the contents of the file from the callback url which is 'Test' (The string I uploaded.)
The short answer is that in the Web Storage SDK you can only get a download URL that represents that data. You'll need to "download" the file using an XMLHttpRequest (or equivalent):
storageRef.child('path/to/string').getDownloadURL().then(function(url) {
var XMLHttp = new XMLHttpRequest();
XMLHttp.onreadystatechange = function() {
if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
var response = xmlHttp.responseText; // should have your text
}
XMLHttp.open("GET", url, true); // true for asynchronous
XMLHttp.send(null);
}).catch(function(error) {
// Handle any errors from Storage
});