STATUS getCanonicalUri()

in src/source/Common/AwsV4Signer.c [785:845]

• 41 lines of code
• 14 McCabe index (conditional complexity)

STATUS getCanonicalUri(PCHAR pUrl, UINT32 len, PCHAR* ppStart, PCHAR* ppEnd, PBOOL pDefault)
{
    STATUS retStatus = STATUS_SUCCESS;
    PCHAR pStart = NULL, pEnd = NULL, pCur;
    UINT32 urlLen;
    BOOL iterate = TRUE, defaultPath = FALSE;

    CHK(pUrl != NULL && ppStart != NULL && ppEnd != NULL && pDefault != NULL, STATUS_NULL_ARG);

    // We know for sure url is NULL terminated
    urlLen = (len != 0) ? len : (UINT32) STRLEN(pUrl);

    // Start from the schema delimiter
    pCur = STRSTR(pUrl, SCHEMA_DELIMITER_STRING);
    CHK(pCur != NULL, STATUS_INVALID_ARG);

    // Advance the pCur past the delimiter
    pCur += STRLEN(SCHEMA_DELIMITER_STRING);

    // Ensure we are not past the string
    pEnd = pUrl + urlLen;
    CHK(pEnd > pCur, STATUS_INVALID_ARG);

    // Check if we have the host delimiter which is slash or a question mark - whichever is first
    while (iterate && pCur < pEnd && *pCur != '\0') {
        if (*pCur == '?') {
            // This is the case of the empty path with query params
            pEnd = pCur;
            pStart = DEFAULT_CANONICAL_URI_STRING;
            defaultPath = TRUE;
            iterate = FALSE;
        } else if (*pCur == '/') {
            // This is the case of the path which we find
            pStart = pCur;
            pEnd = STRNCHR(pCur, urlLen - (UINT32)(pCur - pUrl), '?');
            iterate = FALSE;
        }

        pCur++;
    }

    if (pEnd == NULL) {
        pEnd = pUrl + urlLen;
    }

CleanUp:

    if (ppStart != NULL) {
        *ppStart = pStart;
    }

    if (ppEnd != NULL) {
        *ppEnd = pEnd;
    }

    if (pDefault != NULL) {
        *pDefault = defaultPath;
    }

    return retStatus;
}