AuthAws Unicode C++ Reference Documentation

CkAuthAwsW

Current Version: 10.1.2

Implements AWS Signature V4 for signing and authenticating AWS REST requests.

Object Creation

// Local variable on the stack
CkAuthAwsW obj;

// Dynamically allocate/delete
CkAuthAwsW *pObj = new CkAuthAwsW();
// ...
delete pObj;

Properties

AccessKey
void get_AccessKey(CkString &str);
const wchar_t *accessKey(void);
void put_AccessKey(const wchar_t *str);
Introduced in version 9.5.0.58

The AWS access key.

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CanonicalizedResourceV2
void get_CanonicalizedResourceV2(CkString &str);
const wchar_t *canonicalizedResourceV2(void);
void put_CanonicalizedResourceV2(const wchar_t *str);
Introduced in version 9.5.0.58

If AWS Signature Version V2 is used, then this property must be set. The rules for setting the canonicalized resource for the V2 signature method is described here: Constructing the CanonicalizedResource Element.

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DebugLogFilePath
void get_DebugLogFilePath(CkString &str);
const wchar_t *debugLogFilePath(void);
void put_DebugLogFilePath(const wchar_t *str);

If set to a file path, this property logs the LastErrorText of each Chilkat method or property call to the specified file. This logging helps identify the context and history of Chilkat calls leading up to any crash or hang, aiding in debugging.

Enabling the VerboseLogging property provides more detailed information. This property is mainly used for debugging rare instances where a Chilkat method call causes a hang or crash, which should generally not happen.

Possible causes of hangs include:

  • A timeout property set to 0, indicating an infinite timeout.
  • A hang occurring within an event callback in the application code.
  • An internal bug in the Chilkat code causing the hang.

More Information and Examples
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LastErrorHtml
void get_LastErrorHtml(CkString &str);
const wchar_t *lastErrorHtml(void);

Provides HTML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastErrorText
void get_LastErrorText(CkString &str);
const wchar_t *lastErrorText(void);

Provides plain text information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastErrorXml
void get_LastErrorXml(CkString &str);
const wchar_t *lastErrorXml(void);

Provides XML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastMethodSuccess
bool get_LastMethodSuccess(void);
void put_LastMethodSuccess(bool newVal);

Indicates the success or failure of the most recent method call: true means success, false means failure. This property remains unchanged by property setters or getters. This method is present to address challenges in checking for null or Nothing returns in certain programming languages.

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PrecomputedMd5
void get_PrecomputedMd5(CkString &str);
const wchar_t *precomputedMd5(void);
void put_PrecomputedMd5(const wchar_t *str);
Introduced in version 9.5.0.58

This property can optionally be set for AWS requests that have a non-empty request body. This should be the base64 encoding of the 16 bytes of the MD5 hash. The most common need for this is if doing an S3 upload from a stream. (If the pre-computed MD5 is not provided, then Chilkat is forced to stream the entire file into memory so that it can calculate the MD5 for authentication.)

Note: AWS Signature Version 2 uses the MD5, whereas Signature Version 4 uses SHA256.

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PrecomputedSha256
void get_PrecomputedSha256(CkString &str);
const wchar_t *precomputedSha256(void);
void put_PrecomputedSha256(const wchar_t *str);
Introduced in version 9.5.0.58

This property can optionally be set for AWS requests that have a non-empty request body. This should be the lowercase hex encoding of the 32-bytes of the SHA256 hash. The most common need for this is if doing an S3 upload from a stream. (If the pre-computed SHA-256 is not provided, then Chilkat is forced to stream the entire file into memory so that it can calculate the SHA-256 for authentication.)

Note: AWS Signature Version 4 uses the SHA256 hash. (AWS Signature Version 2 uses MD5)

More Information and Examples
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Region
void get_Region(CkString &str);
const wchar_t *region(void);
void put_Region(const wchar_t *str);
Introduced in version 9.5.0.58

The AWS region, such as "us-east-1", "us-west-2", "eu-west-1", "eu-central-1", etc. The default is "us-east-1". It is only used when the SignatureVersion property is set to 4. This property is unused when the SignatureVersion property is set to 2.

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SecretKey
void get_SecretKey(CkString &str);
const wchar_t *secretKey(void);
void put_SecretKey(const wchar_t *str);
Introduced in version 9.5.0.58

The AWS secret key.

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ServiceName
void get_ServiceName(CkString &str);
const wchar_t *serviceName(void);
void put_ServiceName(const wchar_t *str);
Introduced in version 9.5.0.58

The AWS service namespace, such as "s3", "ses", etc. See http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html#genref-aws-service-namespaces

This property is unused when the SignatureVersion property is set to 2.

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SignatureVersion
int get_SignatureVersion(void);
void put_SignatureVersion(int newVal);
Introduced in version 9.5.0.58

The AWS Signature Version to be used in authentication. The default value is 4. This can optionally be set to the value 2 to use the older V2 signature version.

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VerboseLogging
bool get_VerboseLogging(void);
void put_VerboseLogging(bool newVal);

If set to true, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is false. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
void get_Version(CkString &str);
const wchar_t *version(void);

Version of the component/library, such as "10.1.0"

More Information and Examples
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Methods

GenPresignedUrl
bool GenPresignedUrl(const wchar_t *httpVerb, bool useHttps, const wchar_t *domain, const wchar_t *path, int numSecondsValid, const wchar_t *awsService, CkString &outStr);
const wchar_t *genPresignedUrl(const wchar_t *httpVerb, bool useHttps, const wchar_t *domain, const wchar_t *path, int numSecondsValid, const wchar_t *awsService);
Introduced in version 9.5.0.85

Generates a temporary pre-signed URL for an Amazon AWS service using AWS Signature V4. Requires that the SecretKey, AccessKey, and Region properties be set to valid values prior to calling this method.

The URL that is generated has this format:

https://<domain>/<path>
?X-Amz-Algorithm=AWS4-HMAC-SHA256
&X-Amz-Credential=<AccessKey>/<currentDate>/<Region>/<awsService>/aws4_request
&X-Amz-Date=<currentDateTime>
&X-Amz-Expires=<numSecondsValid>
&X-Amz-SignedHeaders=host
&X-Amz-Signature=<signature-value>  

The httpVerb is the HTTP verb such as "GET", "PUT", "POST", "DELETE", etc. The awsService is a string naming the AWS service, such as "s3", "execute-api", etc. If useHttps is true, then the returned URL begins with "https://", otherwise it begins with "http://".

Returns true for success, false for failure.

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