(PureBasic) Download Google Contact Photo

Demonstrates how to download Google Contact's photo.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkStringBuilder.pb"
IncludeFile "CkAuthGoogle.pb"
IncludeFile "CkRest.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkBinData.pb"

Procedure ChilkatExample()

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

    ; --------------------------------------------------------------------------------------------------------
    ; Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
    ; Once connected, the REST object may be re-used for many REST API calls.
    ; (It's a good idea to put the connection setup code in a separate function/subroutine.)
    ; --------------------------------------------------------------------------------------------------------

    ; It is assumed we previously obtained an OAuth2 access token.
    ; This example loads the JSON access token file 
    ; saved by this example: Get Google Contacts OAuth2 Access Token

    jsonToken.i = CkJsonObject::ckCreate()
    If jsonToken.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i = CkJsonObject::ckLoadFile(jsonToken,"qa_data/tokens/googleContacts.json")
    If success <> 1
        Debug "Failed to load googleContacts.json"
        CkJsonObject::ckDispose(jsonToken)
        ProcedureReturn
    EndIf

    gAuth.i = CkAuthGoogle::ckCreate()
    If gAuth.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkAuthGoogle::setCkAccessToken(gAuth, CkJsonObject::ckStringOf(jsonToken,"access_token"))

    rest.i = CkRest::ckCreate()
    If rest.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Connect using TLS.
    bAutoReconnect.i = 1
    success = CkRest::ckConnect(rest,"www.google.com",443,1,bAutoReconnect)

    ; Provide the authentication credentials (i.e. the access token)
    CkRest::ckSetAuthGoogle(rest,gAuth)

    ; ----------------------------------------------
    ; OK, the REST connection setup is completed..
    ; ----------------------------------------------

    ; To get the photo, send the following:

    ; 	GET /m8/feeds/photos/media/default/contactId

    CkRest::ckAddHeader(rest,"GData-Version","3.0")

    sbPath.i = CkStringBuilder::ckCreate()
    If sbPath.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Get the photo for the contact having contactId = "1ea2e4fe0ef24e09"
    contactId.s = "1ea2e4fe0ef24e09"
    CkStringBuilder::ckSetString(sbPath,"/m8/feeds/photos/media/default/{contactId}")
    numReplacements.i = CkStringBuilder::ckReplace(sbPath,"{contactId}",contactId)

    imageData.i = CkBinData::ckCreate()
    If imageData.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkRest::ckFullRequestNoBodyBd(rest,"GET",CkStringBuilder::ckGetAsString(sbPath),imageData)
    If success <> 1
        Debug CkRest::ckLastErrorText(rest)
        CkJsonObject::ckDispose(jsonToken)
        CkAuthGoogle::ckDispose(gAuth)
        CkRest::ckDispose(rest)
        CkStringBuilder::ckDispose(sbPath)
        CkBinData::ckDispose(imageData)
        ProcedureReturn
    EndIf

    ; A 404 response indicates the contact has no photo.
    ; (We could've first fetched the contact information, parsed out the 
    ; photo etag, and then if no photo etag existed, we'd know the contact has no
    ; photo.  Or... we can just try to download the photo and if a 404 is received,
    ; we know there's no photo.  Much simpler.)
    If CkRest::ckResponseStatusCode(rest) = 404
        Debug "This contact has no photo."
        CkJsonObject::ckDispose(jsonToken)
        CkAuthGoogle::ckDispose(gAuth)
        CkRest::ckDispose(rest)
        CkStringBuilder::ckDispose(sbPath)
        CkBinData::ckDispose(imageData)
        ProcedureReturn
    EndIf

    ; A successful response will have a status code equal to 200.
    If CkRest::ckResponseStatusCode(rest) <> 200
        ; If the response was not successful, then the response body
        ; does not contain image data.  Instead it contains XML.
        sbResponseBody.i = CkStringBuilder::ckCreate()
        If sbResponseBody.i = 0
            Debug "Failed to create object."
            ProcedureReturn
        EndIf

        CkStringBuilder::ckAppendBd(sbResponseBody,imageData,"utf-8",0,0)

        Debug "response status code = " + Str(CkRest::ckResponseStatusCode(rest))
        Debug "response status text = " + CkRest::ckResponseStatusText(rest)
        Debug "response header: " + CkRest::ckResponseHeader(rest)
        Debug "response body: " + CkStringBuilder::ckGetAsString(sbResponseBody)
        Debug "request startline: " + CkRest::ckLastRequestStartLine(rest)
        Debug "request header: " + CkRest::ckLastRequestHeader(rest)
        CkJsonObject::ckDispose(jsonToken)
        CkAuthGoogle::ckDispose(gAuth)
        CkRest::ckDispose(rest)
        CkStringBuilder::ckDispose(sbPath)
        CkBinData::ckDispose(imageData)
        CkStringBuilder::ckDispose(sbResponseBody)
        ProcedureReturn
    EndIf

    ; Examine the content-type in the response header so we know what file
    ; extension to use (.jpg, .png, etc.)
    sbContentType.i = CkStringBuilder::ckCreate()
    If sbContentType.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkStringBuilder::ckAppend(sbContentType,CkRest::ckResponseHdrByName(rest,"Content-Type"))

    If CkStringBuilder::ckContentsEqual(sbContentType,"image/jpeg",0) = 1
        CkBinData::ckWriteFile(imageData,"qa_output/contact_photo.jpg")
    EndIf

    If CkStringBuilder::ckContentsEqual(sbContentType,"image/png",0) = 1
        CkBinData::ckWriteFile(imageData,"qa_output/contact_photo.png")
    EndIf

    Debug "Content-Type: " + CkStringBuilder::ckGetAsString(sbContentType)
    Debug "Success."


    CkJsonObject::ckDispose(jsonToken)
    CkAuthGoogle::ckDispose(gAuth)
    CkRest::ckDispose(rest)
    CkStringBuilder::ckDispose(sbPath)
    CkBinData::ckDispose(imageData)
    CkStringBuilder::ckDispose(sbResponseBody)
    CkStringBuilder::ckDispose(sbContentType)


    ProcedureReturn
EndProcedure