(PureBasic) Amazon Glacier Get Vault Access Policy

Demonstrates how to retrieve the access-policy subresource set on the vault

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkStringBuilder.pb"
IncludeFile "CkAuthAws.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkRest.pb"

Procedure ChilkatExample()

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

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

    ; Connect to the Amazon AWS REST server in the desired region.
    bTls.i = 1
    port.i = 443
    bAutoReconnect.i = 1
    success.i = CkRest::ckConnect(rest,"glacier.us-west-2.amazonaws.com",port,bTls,bAutoReconnect)

    ; Provide AWS credentials.
    authAws.i = CkAuthAws::ckCreate()
    If authAws.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkAuthAws::setCkAccessKey(authAws, "AWS_ACCESS_KEY")
    CkAuthAws::setCkSecretKey(authAws, "AWS_SECRET_KEY")
    CkAuthAws::setCkServiceName(authAws, "glacier")
    CkAuthAws::setCkRegion(authAws, "us-west-2")

    success = CkRest::ckSetAuthAws(rest,authAws)

    ; --------------------------------------------------------------------------
    ; Note: The above REST connection and setup of the AWS credentials
    ; can be done once.  After connecting, any number of REST calls can be made.
    ; The "auto reconnect" property passed to rest.Connect indicates that if
    ; the connection is lost, a REST method call will automatically reconnect
    ; if needed.
    ; --------------------------------------------------------------------------

    ; 
    ; For more information, see Glacier Get Vault Access Policy Reference Documentation
    ; 
    CkRest::ckAddHeader(rest,"x-amz-glacier-version","2012-06-01")

    ; Get the access policy for the "chilkat" vault.
    sbResponseBody.i = CkStringBuilder::ckCreate()
    If sbResponseBody.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkRest::ckFullRequestNoBodySb(rest,"GET","/AWS_ACCOUNT_ID/vaults/chilkat/access-policy",sbResponseBody)
    If success <> 1
        Debug CkRest::ckLastErrorText(rest)
        CkRest::ckDispose(rest)
        CkAuthAws::ckDispose(authAws)
        CkStringBuilder::ckDispose(sbResponseBody)
        ProcedureReturn
    EndIf

    respStatusCode.i = CkRest::ckResponseStatusCode(rest)
    If respStatusCode >= 400
        Debug "Response Status Code = " + Str(respStatusCode)
        Debug "Response Header:"
        Debug CkRest::ckResponseHeader(rest)
        Debug "Response Body:"
        Debug CkStringBuilder::ckGetAsString(sbResponseBody)
        CkRest::ckDispose(rest)
        CkAuthAws::ckDispose(authAws)
        CkStringBuilder::ckDispose(sbResponseBody)
        ProcedureReturn
    EndIf

    ; Success is indicated by a 200 response status.
    Debug "response status code = " + Str(respStatusCode)

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

    CkJsonObject::ckLoadSb(json,sbResponseBody)
    CkJsonObject::setCkEmitCompact(json, 0)

    ; Returns JSON such as this:
    ; {
    ;   "Policy": "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Sid\":\"Define-owner-access-rights\",\"Effect\":\"Allow\",\"Principal\":{\"AWS\":\"arn:aws:iam::9999999999999:root\"},\"Action\":\"glacier:DeleteArchive\",\"Resource\":\"arn:aws:glacier:us-west-2:9999999999999:vaults/chilkat\"}]}"
    ; }

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

    CkJsonObject::ckLoad(jsonPolicy,CkJsonObject::ckStringOf(json,"Policy"))
    CkJsonObject::setCkEmitCompact(jsonPolicy, 0)

    Debug CkJsonObject::ckEmit(jsonPolicy)
    Debug "----"

    ; The jsonPolicy contains:

    ; {
    ;   "Version": "2012-10-17",
    ;   "Statement": [
    ;     {
    ;       "Sid": "Define-owner-access-rights",
    ;       "Effect": "Allow",
    ;       "Principal": {
    ;         "AWS": "arn:aws:iam::9999999999999:root"
    ;       },
    ;       "Action": "glacier:DeleteArchive",
    ;       "Resource": "arn:aws:glacier:us-west-2:9999999999999:vaults/chilkat"
    ;     }
    ;   ]
    ; }
    ; 

    ; Use this online tool to generate parsing code from sample JSON: 
    ; Generate Parsing Code from JSON

    ; To parse the above contents of jsonPolicy...
    Version.s
    i.i
    count_i.i
    Sid.s
    Effect.s
    PrincipalAWS.s
    Action.s
    Resource.s

    Version = CkJsonObject::ckStringOf(jsonPolicy,"Version")
    i = 0
    count_i = CkJsonObject::ckSizeOfArray(jsonPolicy,"Statement")
    While i < count_i
        CkJsonObject::setCkI(jsonPolicy, i)
        Sid = CkJsonObject::ckStringOf(jsonPolicy,"Statement[i].Sid")
        Effect = CkJsonObject::ckStringOf(jsonPolicy,"Statement[i].Effect")
        PrincipalAWS = CkJsonObject::ckStringOf(jsonPolicy,"Statement[i].Principal.AWS")
        Action = CkJsonObject::ckStringOf(jsonPolicy,"Statement[i].Action")
        Resource = CkJsonObject::ckStringOf(jsonPolicy,"Statement[i].Resource")
        i = i + 1
    Wend


    CkRest::ckDispose(rest)
    CkAuthAws::ckDispose(authAws)
    CkStringBuilder::ckDispose(sbResponseBody)
    CkJsonObject::ckDispose(json)
    CkJsonObject::ckDispose(jsonPolicy)


    ProcedureReturn
EndProcedure