(Tcl) Dropbox Refresh OAuth2 Access Token

See more Dropbox Examples

Demonstrates how to mint a new access token using the refresh token obtained when originally getting the OAuth2 access token.

For more information, see https://www.dropbox.com/developers/documentation/http/documentation

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load ./chilkat.dll

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

set http [new_CkHttp]

# Implements the following CURL command:

# curl -X GET https://api.dropbox.com/oauth2/token \
#     -d grant_type=refresh_token \
#     -d refresh_token=<YOUR_REFRESH_TOKEN> \
#     -u <YOUR_APP_KEY>:<YOUR_APP_SECRET>

# Use the following online tool to generate HTTP code from a CURL command
# Convert a cURL Command to HTTP Source Code

CkHttp_put_Login $http "DROPBOX_APP_KEY"
CkHttp_put_Password $http "DROPBOX_APP_SECRET"

# Get the refresh token from the JSON we saved when originally getting the access token.
# (See Get Dropbox OAuth2 Access Token w/ Refresh Token
set json [new_CkJsonObject]

set success [CkJsonObject_LoadFile $json "qa_data/tokens/dropbox.json"]
if {$success == 0} then {
    puts [CkJsonObject_lastErrorText $json]
    delete_CkHttp $http
    delete_CkJsonObject $json
    exit
}

set req [new_CkHttpRequest]

CkHttpRequest_AddParam $req "grant_type" "refresh_token"
CkHttpRequest_AddParam $req "refresh_token" [CkJsonObject_stringOf $json "refresh_token"]

# resp is a CkHttpResponse
set resp [CkHttp_PostUrlEncoded $http "https://api.dropbox.com/oauth2/token" $req]
if {[CkHttp_get_LastMethodSuccess $http] == 0} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkHttp $http
    delete_CkJsonObject $json
    delete_CkHttpRequest $req
    exit
}

set sbResponseBody [new_CkStringBuilder]

CkHttpResponse_GetBodySb $resp $sbResponseBody

set jResp [new_CkJsonObject]

CkJsonObject_LoadSb $jResp $sbResponseBody
CkJsonObject_put_EmitCompact $jResp 0

puts "Response Body:"
puts [CkJsonObject_emit $jResp]

set respStatusCode [CkHttpResponse_get_StatusCode $resp]
puts "Response Status Code = $respStatusCode"
if {$respStatusCode >= 400} then {
    puts "Response Header:"
    puts [CkHttpResponse_header $resp]
    puts "Failed."
    delete_CkHttpResponse $resp

    delete_CkHttp $http
    delete_CkJsonObject $json
    delete_CkHttpRequest $req
    delete_CkStringBuilder $sbResponseBody
    delete_CkJsonObject $jResp
    exit
}

delete_CkHttpResponse $resp

# Sample JSON response:
# (Sample code for parsing the JSON response is shown below)

# {
#   "access_token": "sl.AC75WPYRqOi0mxcRqlimbV9FKHu04biz5qHwatG3MTgzFK7kLrGVlM9EgP4603tE7bWw0s1rMbTKiHsf37TUshPYvq-3r0qeBr_PrZIAibN8XOQicvboiOnqx6JrDekq-w8D-tE",
#   "token_type": "bearer",
#   "expires_in": 14400
# }

set access_token [CkJsonObject_stringOf $jResp "access_token"]
puts "New Access Token: $access_token"

# Perhaps update our Dropbox JSON file with the new access token.
# (The existing refresh token does not change, and can be used over and over to mint new access tokens.)
CkJsonObject_UpdateString $json "access_token" $access_token

CkJsonObject_WriteFile $json "qa_data/tokens/dropbox.json"

delete_CkHttp $http
delete_CkJsonObject $json
delete_CkHttpRequest $req
delete_CkStringBuilder $sbResponseBody
delete_CkJsonObject $jResp