So I am trying to download a file via axios and blob. The problem is I need to pass a password, and for that reason I can't use a "GET" request. For test purposes I still made a "GET" request to get me started. Since the project comes to an end I wanted to finally fix that issue but I can't find a solution.
That is my working code with a "GET" request to give you an idea.
axios({
url: `/api/download/?uuid=${uuid}&password=${password}`,
method: "GET",
responseType: "blob",
})
.then((response) => {
var fileURL = window.URL.createObjectURL(
new Blob([response.data])
);
var fileLink = document.createElement("a");
fileLink.href = fileURL;
fileLink.setAttribute("download", filename);
document.body.appendChild(fileLink);
fileLink.click();
self.showLottie = false;
})
.catch(function (error) {
self.showLottie = false;
alert("Download failed");
});
Ok, so basically all I had to do was putting the uuid and password in a params object.
axios({
url: `/api/download`,
method: "GET",
responseType: "blob",
params: {
uuid,
password,
},
})
.then((response) => {
var fileURL = window.URL.createObjectURL(
new Blob([response.data])
);
var fileLink = document.createElement("a");
fileLink.href = fileURL;
fileLink.setAttribute("download", filename);
document.body.appendChild(fileLink);
fileLink.click();
self.showLottie = false;
})
.catch(function () {
self.showLottie = false;
alert("Download failed");
});
Explanation: Are HTTPS URLs encrypted?
Related
i need to take url with params example:
https://domain.pl/ptpdf-gen?selected_posts=4871&advisor=magda,wojciech
But axios response is an object like:
{"https://domain.pl/ptpdf-gen?selected_posts":"4871","advisor":"magda,wojciech"}
How to send url as string via axios?
Optionally the request above could also be done as
axios.get('/user', {
params: {
selected_posts: 4871
advisor: ["magda", "Wojciech"]
},
paramsSerializer: params => {
return qs.stringify(params)
}
})
.then(function (response) {
console.log(response);
})
.catch(function (error) {
console.log(error);
})
.then(function () {
// always executed
});
The qs is an external library,
https://www.npmjs.com/package/qs
var selected = 4871
var advisor = ["magda","wojciech"]
axios.post('https://domain.pl/ptpdf-gen', {selected, advisor })
So i made the url split like this, using URLSearchParams:
const currHref = window.location.search;
const urlParams = new URLSearchParams(window.location.search);
const myParam = urlParams.get('selected_posts');
const myParam2 = urlParams.get('advisor');
Then with axios.post i can send params:
axios.post("http://domain.pl/create", {myParam, myParam2})
On server i did handle params like:
const state = req.body;
const stateValues = Object.values(state);
And then i can concat url with stateValues[0] and stateValues[1];
let linkUrl = "https://domain.pl/ptpdf-gen?selected_posts=" + stateValues[0] + "&advisor=" + stateValues[1];
Works.
I have my REST API where I put my pdf file, now I want my angular app to download it on click via my web browser but I got HttpErrorResponse
"Unexpected token % in JSON at position 0"
"SyntaxError: Unexpected token % in JSON at position 0↵ at JSON.parse (
this is my endpoint
#GetMapping("/help/pdf2")
public ResponseEntity<InputStreamResource> getPdf2(){
Resource resource = new ClassPathResource("/pdf-sample.pdf");
long r = 0;
InputStream is=null;
try {
is = resource.getInputStream();
r = resource.contentLength();
} catch (IOException e) {
e.printStackTrace();
}
return ResponseEntity.ok().contentLength(r)
.contentType(MediaType.parseMediaType("application/pdf"))
.body(new InputStreamResource(is));
}
this is my service
getPdf() {
this.authKey = localStorage.getItem('jwt_token');
const httpOptions = {
headers: new HttpHeaders({
'Content-Type': 'application/pdf',
'Authorization' : this.authKey,
responseType : 'blob',
Accept : 'application/pdf',
observe : 'response'
})
};
return this.http
.get("http://localhost:9989/api/download/help/pdf2", httpOptions);
}
and invocation
this.downloadService.getPdf()
.subscribe((resultBlob: Blob) => {
var downloadURL = URL.createObjectURL(resultBlob);
window.open(downloadURL);});
I resolved it as follows:
// header.component.ts
this.downloadService.getPdf().subscribe((data) => {
this.blob = new Blob([data], {type: 'application/pdf'});
var downloadURL = window.URL.createObjectURL(data);
var link = document.createElement('a');
link.href = downloadURL;
link.download = "help.pdf";
link.click();
});
//download.service.ts
getPdf() {
const httpOptions = {
responseType: 'blob' as 'json')
};
return this.http.get(`${this.BASE_URL}/help/pdf`, httpOptions);
}
I solved the issue in this way (please note that I have merged multiple solutions found on stack overflow, but I cannot find the references. Feel free to add them in the comments).
In My service I have:
public getPDF(): Observable<Blob> {
//const options = { responseType: 'blob' }; there is no use of this
let uri = '/my/uri';
// this.http refers to HttpClient. Note here that you cannot use the generic get<Blob> as it does not compile: instead you "choose" the appropriate API in this way.
return this.http.get(uri, { responseType: 'blob' });
}
In the component, I have (this is the part merged from multiple answers):
public showPDF(fileName: string): void {
this.myService.getPDF()
.subscribe(x => {
// It is necessary to create a new blob object with mime-type explicitly set
// otherwise only Chrome works like it should
var newBlob = new Blob([x], { type: "application/pdf" });
// IE doesn't allow using a blob object directly as link href
// instead it is necessary to use msSaveOrOpenBlob
if (window.navigator && window.navigator.msSaveOrOpenBlob) {
window.navigator.msSaveOrOpenBlob(newBlob, fileName);
return;
}
// For other browsers:
// Create a link pointing to the ObjectURL containing the blob.
const data = window.URL.createObjectURL(newBlob);
var link = document.createElement('a');
link.href = data;
link.download = fileName;
// this is necessary as link.click() does not work on the latest firefox
link.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true, view: window }));
setTimeout(function () {
// For Firefox it is necessary to delay revoking the ObjectURL
window.URL.revokeObjectURL(data);
link.remove();
}, 100);
});
}
The code above works in IE, Edge, Chrome and Firefox. However, I don't really like it, as my component is pulluted with browser specific stuff which will surely change over time.
For Angular 12+, I came up with something like this:
this.ApiService
.getFileFromApi()
.pipe(take(1))
.subscribe((response) => {
const downloadLink = document.createElement('a');
downloadLink.href = URL.createObjectURL(new Blob([response.body], { type: response.body.type }));
const contentDisposition = response.headers.get('content-disposition');
const fileName = contentDisposition.split(';')[1].split('filename')[1].split('=')[1].trim();
downloadLink.download = fileName;
downloadLink.click();
});
The subscribe is on a simple get() with the Angular HttpClient.
// api-service.ts
getFileFromApi(url: string): Observable<HttpResponse<Blob>> {
return this.httpClient.get<Blob>(this.baseApiUrl + url, { observe: 'response', responseType: 'blob' as 'json'});
}
You can do it with angular directives:
#Directive({
selector: '[downloadInvoice]',
exportAs: 'downloadInvoice',
})
export class DownloadInvoiceDirective implements OnDestroy {
#Input() orderNumber: string;
private destroy$: Subject<void> = new Subject<void>();
_loading = false;
constructor(private ref: ElementRef, private api: Api) {}
#HostListener('click')
onClick(): void {
this._loading = true;
this.api.downloadInvoice(this.orderNumber)
.pipe(
takeUntil(this.destroy$),
map(response => new Blob([response], { type: 'application/pdf' })),
)
.subscribe((pdf: Blob) => {
this.ref.nativeElement.href = window.URL.createObjectURL(pdf);
this.ref.nativeElement.click();
});
}
// your loading custom class
#HostBinding('class.btn-loading') get loading() {
return this._loading;
}
ngOnDestroy(): void {
this.destroy$.next();
this.destroy$.complete();
}
}
In the template:
<a
downloadInvoice
[orderNumber]="order.number"
class="btn-show-invoice"
>
Show invoice
</a>
My answer is based on #Yennefer's, but I wanted to use the file name from the server since I didn't have it in my FE. I used the Content-Disposition header to transmit this, since that is what the browser uses for a direct download.
First, I needed access to the headers from the request (notice the get method options object):
public getFile(): Observable<HttpResponse<Blob>> {
let uri = '/my/uri';
return this.http.get(uri, { responseType: 'blob', observe: 'response' });
}
Next, I needed to extract the file name from the header.
public getFileName(res: HttpResponse<any>): string {
const disposition = res.headers.get('Content-Disposition');
if (!disposition) {
// either the disposition was not sent, or is not accessible
// (see CORS Access-Control-Expose-Headers)
return null;
}
const utf8FilenameRegex = /filename\*=UTF-8''([\w%\-\.]+)(?:; |$)/;
const asciiFilenameRegex = /filename=(["'])(.*?[^\\])\1(?:; |$)/;
let fileName: string = null;
if (utf8FilenameRegex.test(disposition)) {
fileName = decodeURIComponent(utf8FilenameRegex.exec(disposition)[1]);
} else {
const matches = asciiFilenameRegex.exec(disposition);
if (matches != null && matches[2]) {
fileName = matches[2];
}
}
return fileName;
}
This method checks for both ascii and utf-8 encoded file names, prefering utf-8.
Once I have the file name, I can update the download property of the link object (in #Yennifer's answer, that's the lines link.download = 'FileName.ext' and window.navigator.msSaveOrOpenBlob(newBlob, 'FileName.ext');)
A couple of notes on this code:
Content-Disposition is not in the default CORS whitelist, so it may not be accessible from the response object based on the your server's configuration. If this is the case, in the response server, set the header Access-Control-Expose-Headers to include Content-Disposition.
Some browsers will further clean up file names. My version of chrome seems to replace : and " with underscores. I'm sure there are others but that's out of scope.
//Step: 1
//Base Service
this.getPDF() {
return this.http.get(environment.baseUrl + apiUrl, {
responseType: 'blob',
headers: new HttpHeaders({
'Access-Control-Allow-Origin': '*',
'Authorization': localStorage.getItem('AccessToken') || ''
})
});
}
//Step: 2
//downloadService
getReceipt() {
return new Promise((resolve, reject) => {
try {
// {
const apiName = 'js/getReceipt/type/10/id/2';
this.getPDF(apiName).subscribe((data) => {
if (data !== null && data !== undefined) {
resolve(data);
} else {
reject();
}
}, (error) => {
console.log('ERROR STATUS', error.status);
reject(error);
});
} catch (error) {
reject(error);
}
});
}
//Step 3:
//Component
getReceipt().subscribe((respect: any) => {
var downloadURL = window.URL.createObjectURL(data);
var link = document.createElement(‘a’);
link.href = downloadURL;
link.download = “sample.pdf";
link.click();
});
This also works in IE and Chrome, almost the same answer only for other browsers the answer is a bit shorter.
getPdf(url: string): void {
this.invoiceService.getPdf(url).subscribe(response => {
// It is necessary to create a new blob object with mime-type explicitly set
// otherwise only Chrome works like it should
const newBlob = new Blob([(response)], { type: 'application/pdf' });
// IE doesn't allow using a blob object directly as link href
// instead it is necessary to use msSaveOrOpenBlob
if (window.navigator && window.navigator.msSaveOrOpenBlob) {
window.navigator.msSaveOrOpenBlob(newBlob);
return;
}
// For other browsers:
// Create a link pointing to the ObjectURL containing the blob.
const downloadURL = URL.createObjectURL(newBlob);
window.open(downloadURL);
});
}
I have integrated passport-jwt for authentication purpose. It's working like charm but whenever Frontend guy use it from frontend angular 2 its giving Unauthorised 401 . I've tried alot but not getting any clue, it must be a silly mistake though.
my passport strategy file is as
let JwtStrategy = require('passport-jwt').Strategy,
ExtractJwt = require('passport-jwt').ExtractJwt;
//let fromHeader = require('passport-jwt').fromHeader
// load up the user model
const User = require('../components/user/model');
const database = require('./database'); // get db config file
const config = require('./config'); // get db config file
module.exports = function(passport) {
//var passportStrategy = function(passport){
let opts = {};
opts.jwtFromRequest = ExtractJwt.fromAuthHeader();
//opts.jwtFromRequest = ExtractJwt.fromAuthHeaderWithScheme("JWT");
console.log("opts.jwtFromRequest==",opts.jwtFromRequest);
opts.secretOrKey = config.secret;//config.secret;
passport.use(new JwtStrategy(opts, function(jwt_payload, done) {
//console.log("opt==",JSON.stringify(opt));
//console.log("jwt_payload===",jwt_payload);
User.findOne({_id: jwt_payload._doc._id}, function(err, user) {
if (err) {
return done(err, false);
}
if (user) {
done(null, user);
} else {
done(null, false);
}
});
}));
};
my route is as
app.get("/api/user/getAll",
passport.authenticate('jwt',{session:false}),
userController.fetchUsers
);
And frontend header append is as follows :
logoutUser(token) {
//const userData = JSON.stringify(userInfo);
var headers = new Headers();
headers.append('Content-Type', 'application/json');
headers.append('Authorization', token); //e.g.token = JWT dasddddasdsda
//headers.append('Authentication', token);
console.log(headers)
return this.http.post('http://localhost:9000/api/user/logout', { headers: headers })
.map((response: Response) =〉 {
return response.json()
})
.catch(this.errorHandler);
}
It would really great if anyone can assist me further to identify the mistake.
Second argument for the post method is payload.
so this code below
this.http.post('http://localhost:9000/api/user/logout', { headers: headers })
has to be
this.http.post('http://localhost:9000/api/user/logout', {}, { headers: headers })
I have some upload working for superagent. It involves posting to an api for cloudinary. My question is how do I do the same thing with axios. I'm not sure what superagent.attach and superagent.field relate to in axios.
Basically when I make the post request I need to attach all these fields to the request or else I get bad request and I want to do this in axios not superagent as I am switching over to axios.
Here are all the params:
const image = files[0];
const cloudName = 'tbaustin';
const url = `https://api.cloudinary.com/v1_1/${cloudName}/image/upload`;
const timestamp = Date.now()/1000;
const uploadPreset = 'cnh7rzwp';
const paramsStr = `timestamp=${timestamp}&upload_preset=${uploadPreset}ORor-6scjYwQGpNBvMW2HGMkc8k`;
const signature = sha1(paramsStr);
const params = {
'api_key': '177287448318217',
'timestamp': timestamp,
'upload_preset': uploadPreset,
'signature': signature
}
Here is the superagent post request:
let uploadRequest = superagent.post(url)
uploadRequest.attach('file', image);
Object.keys(params).forEach((key) => {
uploadRequest.field(key, params[key]);
});
uploadRequest.end((err, res) => {
if(err) {
alert(err);
return
}
You would need to use FromData as follows:
var url = `https://api.cloudinary.com/v1_1/${cloudName}/upload`;
var fd = new FormData();
fd.append("upload_preset", unsignedUploadPreset);
fd.append("tags", "browser_upload"); // Optional - add tag for image admin in Cloudinary
fd.append("signature", signature);
fd.append("file", file);
const config = {
headers: { "X-Requested-With": "XMLHttpRequest" },
onUploadProgress: function(progressEvent) {
// Do something with the native progress event
}
};
axios.post(url, fd, config)
.then(function (res) {
// File uploaded successfully
console.log(res.data);
})
.catch(function (err) {
console.error('err', err);
});
See full example here
I am attempting to make a http.post call with angular 2. I have tested the call in postman, so I know that the api is working. I get an error, input empty which means that it isn't getting the data. I've read a few answers and articles, but not able to make a successful call with the data.
Can anyone give me some insight into what I am missing?
public upload(name: string, data: any, result, contentType: string) : Promise<Response> {
let headers = new Headers({ 'Content-Type': contentType });
let options = new RequestOptions({ headers: headers });
return this.http
.post(this.urlAPI, data, options)
.toPromise()
.then(this.extractData)
.catch(this.handleError);
}
extractData(res:Response) {
console.log('res: ', res);
let body = res.json();
return Promise.resolve(res);
}
handleError(err: any): Promise<any> {
console.error('An Error has occured: ', err);
return Promise.reject(err);
}
I am not sure what is the type of your 'data'. Data has to be stringified before sent. Below is a workable version for me.
saveNote(note: ApprovalNoteModel): Observable<ApprovalNoteModel> {
let body = JSON.stringify(note);
let headers = this.utilsSvc.getAuthHeaders();
headers.set('Content-Type', 'application/json');
return this.http.post('cloud/api/approval/note', body,
{ headers: headers }
).map(response => response.json());
}
If it is a file, then you can not do that thru 'http', I believe. Here is my workable version.
addFileRequest(referenceId: number, licenseId: number, url: string, files: File[]): Observable<any> {
return Observable.create(observer => {
this.progressObserver = observer;
let formData: FormData = new FormData(),
xhr: XMLHttpRequest = new XMLHttpRequest();
formData.append('referenceId', referenceId);
formData.append('licenseId', licenseId);
for (let i = 0; i < files.length; i++) {
formData.append("uploads[]", files[i], files[i].name);
}
xhr.onreadystatechange = () => {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
observer.next(xhr.response);
observer.complete();
} else {
if (xhr.response.status)
observer.error(xhr.response);
else
observer.error({ 'status': xhr.status, '_body': xhr.response });
}
}
};
xhr.upload.onprogress = (event) => {
this.progress = Math.round(event.loaded / event.total * 100);
this.progressObserver.next(this.progress);
};
xhr.open('POST', url, true);
xhr.setRequestHeader('Authorization', this.utilsSvc.getToken());
xhr.send(formData);
});
}