(Tcl) Amazon Glacier Get Vault Access Policy

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

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load ./chilkat.dll

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

set rest [new_CkRest]

# Connect to the Amazon AWS REST server in the desired region.
set bTls 1
set port 443
set bAutoReconnect 1
set success [CkRest_Connect $rest "glacier.us-west-2.amazonaws.com" $port $bTls $bAutoReconnect]

# Provide AWS credentials.
set authAws [new_CkAuthAws]

CkAuthAws_put_AccessKey $authAws "AWS_ACCESS_KEY"
CkAuthAws_put_SecretKey $authAws "AWS_SECRET_KEY"
CkAuthAws_put_ServiceName $authAws "glacier"
CkAuthAws_put_Region $authAws "us-west-2"

set success [CkRest_SetAuthAws $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_AddHeader $rest "x-amz-glacier-version" "2012-06-01"

# Get the access policy for the "chilkat" vault.
set sbResponseBody [new_CkStringBuilder]

set success [CkRest_FullRequestNoBodySb $rest "GET" "/AWS_ACCOUNT_ID/vaults/chilkat/access-policy" $sbResponseBody]
if {$success != 1} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    delete_CkAuthAws $authAws
    delete_CkStringBuilder $sbResponseBody
    exit
}

set respStatusCode [CkRest_get_ResponseStatusCode $rest]
if {$respStatusCode >= 400} then {
    puts "Response Status Code = $respStatusCode"
    puts "Response Header:"
    puts [CkRest_responseHeader $rest]
    puts "Response Body:"
    puts [CkStringBuilder_getAsString $sbResponseBody]
    delete_CkRest $rest
    delete_CkAuthAws $authAws
    delete_CkStringBuilder $sbResponseBody
    exit
}

# Success is indicated by a 200 response status.
puts "response status code = $respStatusCode"

set json [new_CkJsonObject]

CkJsonObject_LoadSb $json $sbResponseBody
CkJsonObject_put_EmitCompact $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...
set jsonPolicy [new_CkJsonObject]

CkJsonObject_Load $jsonPolicy [CkJsonObject_stringOf $json "Policy"]
CkJsonObject_put_EmitCompact $jsonPolicy 0

puts [CkJsonObject_emit $jsonPolicy]
puts "----"

# 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...

set Version [CkJsonObject_stringOf $jsonPolicy "Version"]
set i 0
set count_i [CkJsonObject_SizeOfArray $jsonPolicy "Statement"]
while {$i < $count_i} {
    CkJsonObject_put_I $jsonPolicy $i
    set Sid [CkJsonObject_stringOf $jsonPolicy "Statement[i].Sid"]
    set Effect [CkJsonObject_stringOf $jsonPolicy "Statement[i].Effect"]
    set PrincipalAWS [CkJsonObject_stringOf $jsonPolicy "Statement[i].Principal.AWS"]
    set Action [CkJsonObject_stringOf $jsonPolicy "Statement[i].Action"]
    set Resource [CkJsonObject_stringOf $jsonPolicy "Statement[i].Resource"]
    set i [expr $i + 1]
}

delete_CkRest $rest
delete_CkAuthAws $authAws
delete_CkStringBuilder $sbResponseBody
delete_CkJsonObject $json
delete_CkJsonObject $jsonPolicy