how to download a file with php and angular - php

Question

I already uploaded a file and saved the path into my database, but the problem now is that I can't download it. I have already tested the PHP code and it works, but when I try to download it from the Angular side it doesn't. Instead I get this error in the console:
httpErrorResponse error: SyntaxError: Unexpected token p in JSON at position 0
at JSON.parse (<anonymous>)
at XMLHttpRequest.onLoad (localhost:4200/vendor.js:164415:51)
at ZoneDelegate.invokeTask (localhost:4200/polyfills.js:9799:31)
.........
ANGULAR SERVICE:
public getjointes(filepath:string){
const params = new HttpParams()
.set('filepath', filepath);
return this.http.get(url+'/download.php', {params: params });
}
TYPESCRIPT / function
telecharger(path:string) {
console.log(path);
this.stream.getjointes(path).subscribe(response => {
console.log(response);
});
}
PHP CODE:
$rest = $_GET['filepath'] ;
echo($rest);
$filepath = 'upload/' . $rest;
if (file_exists($filepath)) {
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . basename($filepath));
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize('upload/' . $rest));
readfile('upload/' . $rest);
header("Access-Control-Expose-Headers: Content-Disposition");
}
else{
echo ('noo');
}

Answer 1

Ok I'm going to assume the echo statements in your PHP are just for testing, based on the error messages you included in comments.
I think the problem you're having is that Angular assumes the response will be JSON and attempts to parse it. To avoid this behaviour, you can set the responseType parameter to "text" or "blob" (for binary data) in your code:
public getjointes(filepath:string) {
const params = new HttpParams()
.set('filepath', filepath);
return this.http.get(url+'/download.php', {params: params, responseType: "text"});
}
Note that any output before a call to header() will result in the HTTP header not getting set. Your PHP code calls header() after readfile(). That header will be ignored. In addition, if a file is not found you should say so with a proper 404 header. This way your client-side code can respond properly to failures. Your PHP should look like this:
$rest = $_GET['filepath'];
$filepath = 'upload/' . $rest;
if (file_exists($filepath) && is_readable($filepath)) {
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . basename($filepath));
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize('upload/' . $rest));
header("Access-Control-Expose-Headers: Content-Disposition");
readfile('upload/' . $rest);
} else {
header("HTTP/1.0 404 Not Found");
}