“Not allowed to load local resource” for Local image from Remote page in PhoneGap Build

问题

I'm hosting my webpages for a phonegap build app. I'd like to use the camera to upload a photo, and show a preview the image, basically doing this:

<img src="file:///storage/emulated/0/Android/data/com.myapp.myapp/cache/1470418568917.jpg" height="500" />

Because my pages are hosted I'm getting this error:

Not allowed to load local resource: file:///storage/emulated/0/Android/data/com.myapp.myapp/cache/1470418568917.jpg", source: https://www.myapp.com/v5.5/imager.html#

I assume that this is some CORS problem, so I've added this to the html of the page

<meta http-equiv="Content-Security-Policy" content="default-src *; style-src * 'unsafe-inline'; script-src * 'unsafe-inline' 'unsafe-eval'; media-src *; img-src * filesystem: data:">

and this to my config.xml (I'm using Phonegap Build)

 <plugin name="cordova-plugin-whitelist" source="npm" />

 <allow-navigation href="*" />
 <allow-navigation href="*://*/*" />
 <allow-navigation href="file:///*/*" />
 <allow-navigation href="http://*/*" />
 <allow-navigation href="https://*/*" />
 <allow-navigation href="data:*" />

 <allow-intent href="*" />
 <allow-intent href="http://*/*" />
 <allow-intent href="https://*/*" />
 <allow-intent href="tel:*" />
 <allow-intent href="sms:*" />
 <allow-intent href="mailto:*" />
 <allow-intent href="geo:*" />

 <access origin="*" />
 <access origin="*://*/*" />
 <access origin="file:///*" />
 <access origin="cdvfile://*" />
 <access origin="content:///*" />

As you can see I've tried every setting I can think of, from scouring the web. Am I missing something obvious?

Thanks in advance.

回答1:

OK finally got a workaround, which is to convert the file:/// URI to a cdvfile:// URI, which my page only complains is a mixed content warning, and does allow me to access!

function getFileEntry(imgUri) {
            window.resolveLocalFileSystemURL(imgUri, function success(fileEntry) {
                console.log("got file: " + fileEntry.fullPath);
                console.log('cdvfile URI: ' + fileEntry.toInternalURL());
                $('#imgPreview').attr("src", fileEntry.toInternalURL());
            });
        }

Would still be nice to have a proper way to access file:/// URIs, I can see cases where this wouldn't work, but for what I'm doing this is resolved.

回答2:

Something to note here for future users who run into this, be sure you are NOT running in 'Live Reload' mode when testing a feature like this. Live Reload will result in this same error message which is clearly misleading. After building w/o live reload everything worked fine for me using the file:/ OR cdv:/ path.

回答3:

I have recently faced same issue. Appears that cordova ios app is run on localhost:8080 internally, this is main reason why it doesn`t allow to load files from "file://" protocol.

easy fix - "var workingPath = window.Ionic.normalizeURL(givenPath)";

Please read article from IONIC about that - https://ionicframework.com/docs/wkwebview/

回答4:

This is working with ionic 3 and you can use below to resolve the issue for Not allowed to load local resourse

First put these things in home.ts

import { Base64 } from '@ionic-native/base64';
import { DomSanitizer, SafeResourceUrl, SafeUrl } from 
'@angular/platform-browser';

//inside the export class
base64Image:any;
croppedImage = null;

constructor(
  public base64:Base64,
  public domSanitizer:DomSanitizer,
) {}    

selectImage() {
const options: CameraOptions = {
  quality: 100,
  destinationType: this.camera.DestinationType.FILE_URI,
  encodingType: this.camera.EncodingType.JPEG,
  mediaType: this.camera.MediaType.PICTURE,
  correctOrientation: true,
  sourceType:0,
}
  this.croppedImage = null;
  this.camera.getPicture(options).then((imageData) => {
  this.croppedImage = imageData;
  this.crop.crop(this.croppedImage, {quality: 100,targetWidth: -1, targetHeight: 
-1 })
.then(
newImage => {
  this.base64.encodeFile(newImage).then((base64File: string) => {
  let imageSrc = base64File.split(",");
  this.base64Image = 'data:image/jpeg;base64,' + imageSrc[1];
  this.croppedImage = 
  this.domSanitizer.bypassSecurityTrustUrl('data:image/jpeg;base64,' + 
imageSrc[1]);
}, (err) => {
  console.log(err);
});
  console.log('new image path is: ' + newImage);
},
error => {
  console.error('Error cropping image', error);
}
);
//  this.myImage = 'data:image/jpeg;base64,' + imageData;
});
}   

Then now in the view home.html put below things

    <button ion-button full (click)="selectImage()" 
 *ngIf="!base64Image">Gallery</button>
    <button ion-button full (click)="selectImageFromCamera()">Camera</button>
    <ion-row *ngIf="croppedImage">
       <ion-card>
          <ion-card-header>Cropped Image</ion-card-header>
          <ion-card-content padding>
             <img [src]="croppedImage">
          </ion-card-content>
       </ion-card>
    </ion-row>`enter code here`

回答5:

The answer from @Vladyslav Goloshchapov is the correct one for my situation (using the non-deprecated form).

I'm trying to open an Ionic app from within an Ionic app (both Ionic 4) using phonegap-plugin-contentsync which allows you to download and unzip a file (an Ionic app in my case) into the local filesystem. (The 2nd app isn't a published app).

I used this as: window.location.href = window.Ionic.WebView.convertFileSrc(url); for iOS.

Android is not as complicated so you can use window.open(url, '_self');

My URL is in the format (for iOS): file:///var/mobile/Containers/Data/Application/[UUID]/Library/NoCloud/[appFolder]/index.html

回答6:

I was working on ionic3 app and testing the console using chrome inspector. I was also running and emulating with the --livereload Flag, It was not showing image not on emulator nor on real device. I go to Above mentioned link and imported the module
import { normalizeURL } from 'ionic-angular';
on the success callback of my image capture function, I passed the path like this and it worked like a charm.
After investigating a little bit more, I found out that its because of --livereload Flag, I removed the flag from command , run the programme with the following command and its showing image now:
ionic cordova run android

    takePhoto() {
        this.camera.getPicture(this.getCameraOptions()).then((imageData) => {
         this.isPhotoTaken = true;
         this.photo = normalizeURL(imageData); 
         console.log("PHOTO PATH: "+ this.photo)
        }, (err) => {
            console.error('IMAGE CAPTURE ERROR: ' + err);
        });
      }

     setCameraOptions() {    
        const options = {
          quality: 100,
          sourceType: this.camera.PictureSourceType.CAMERA,
          saveToPhotoAlbum: false,
          correctOrientation: true
        };
        return options;
      }

  getCameraOptions(): CameraOptions{
    return this.setCameraOptions();
  }

来源：https://stackoverflow.com/questions/38795550/not-allowed-to-load-local-resource-for-local-image-from-remote-page-in-phonega