I want to download a file into the phone storage from a mobile application with ClojureScript and react-native. Files are already uploaded to an Amazon S3 bucket. The file URLs would be something like https://s3.amazonaws.com/client-texastech/uploads/art_pictures-images/comma-2005-06/96acad35-7f3f-4b10-a104-5bf59b92b463/medium/image.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIQETNIOQ45P7UIKQ%2F20181113%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20181113T023654Z&X-Amz-Expires=300&X-Amz-SignedHeaders=host&X-Amz-Signature=576787721283e1c2b0d8fd2349cd304b5f7f717491edb32d8d7ba256ef52f6a8
I found react-native-fetch-blob for doing it.
I tried to use it:
(def RNFetchBlob (js/require "react-native-fetch-blob"))
(def fetch-blob (oget RNFetchBlob "default"))
(def fs (oget RNFetchBlob "fs"))
(defn download-url [app-db url]
(p/promise (fn [resolve reject]
(let [fs (oget fetch-blob "fs")
dir-path (str (oget (oget fs "dirs") "DocumentDir") "/image.png")
fetch-config (ocall fetch-blob "config" {
:addAndroidDownloads {:useDownloadManager true :path dir-path :notification true}
:Cache-Control "no-store"})
fetch-file (ocall fetch-config "fetch" "GET" url (util/get-token app-db))
base64 (oget fetch-blob "base64")]
(ocall fetch-file "then" (fn [res]
(.log js/console "Download file completed." res)
(resolve true)))
(ocall fetch-file "catch" (fn [res]
(.log js/console "Download file failed" res)
(resolve false)))
#js{:timeout 600000
:distanceFilter 1
:maximumAge 1000
:enableHighAccuracy false}))))
The download completed. But, I can't find the file in any of the folders. Is there anything wrong? If so, can anyone share the code snippet?
Finally, I was able to download the file. The issue is where I pass parameters to the config call. We should convert Clojure to JS by using clj->js. The updated method will be as follows:
(defn download-image-android [app-db url image-id]
(p/promise (fn [resolve reject]
(let [fs (oget fetch-blob "fs")
android-dir-path (str (oget (oget fs "dirs") "DownloadDir") "/" image-id ".jpg")
params (parse-params url)
fetch-config (ocall fetch-blob "config" (clj->js {
:fileCache true
:addAndroidDownloads {:useDownloadManager true :path android-dir-path :notification true}}))
fetch-file (ocall fetch-config "fetch" "GET" url (clj->js {:Signature (:X-Amz-Signature params)
:Cache-Control "no-store"}))]
(ocall fetch-file "then" (fn [res]
(show-alert "Success" "Image has been saved to the phone successfully!")
(resolve true)))
(ocall fetch-file "catch" (fn [res]
(show-alert "Error" "Image cannot be downloaded. Please try again!")
(.log js/console "Download file failed" res)
(resolve false)))
#js{:timeout 30000
:distanceFilter 1
:maximumAge 1000
:enableHighAccuracy false}))))