C++

REST URL Encode Path Parts and Query Params

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When passing a path to a Chilkat REST function, the path parts and query params should be URL encoded. This example explains.. C++

#include <CkRest.h>
#include <CkAuthAws.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    // This example demonstrates how to URL encode the path passed to a REST function.
    // It is demonstrated with an Amazon SP API GET request to get details about a listings item for a selling partner.
    // See https://developer-docs.amazon.com/sp-api/docs/listings-items-api-v2021-08-01-reference#getlistingsitem

    CkRest rest;

    // Connect to the REST server.
    bool bTls = true;
    int port = 443;
    bool bAutoReconnect = true;
    success = rest.Connect("sellingpartnerapi-eu.amazon.com",port,bTls,bAutoReconnect);

    rest.ClearAllQueryParams();
    rest.AddQueryParam("marketplaceids","XYZABC123");
    rest.AddQueryParam("includedData","offers");

    rest.AddHeader("x-amz-access-token","YOUR_ACCESS_TOKEN");

    CkAuthAws authAws;
    authAws.put_AccessKey("YOUR_AWS_APP_ID");
    authAws.put_SecretKey("YOUR_AWS_APP_SECRET_KEY");
    authAws.put_Region("eu-west-1");
    authAws.put_ServiceName("execute-api");
    rest.SetAuthAws(authAws);

    // The path that is passed to FullRequestNobBody

    // Here's a sample path that is not yet URL encoded.
    const char *path = "/listings/2022-07-01/items/ABCDEFGHIJ/100x100_28g_LANCETS(BOXED)";

    // The path passed to FullRequestNoBody needs to have the parts URL-encoded.
    // The "/" chars are not URL encoded, but the individual path parts should be URL encoded.
    // For example:  /listings/2022-07-01/items/ABCDEFGHIJ/100x100_28g_LANCETS%28BOXED%29

    // In this case, we'll prepare the path like this:
    CkStringBuilder sbPath;
    sbPath.Append("100x100_28g_LANCETS(BOXED)");
    // URL encode the contents of the sbPath.
    sbPath.Encode("url","utf-8");
    // Prepend the remaining which does not need to be URL encoded.
    sbPath.Prepend("/listings/2022-07-01/items/ABCDEFGHIJ/");

    std::cout << "URL encoded path: " << sbPath.getAsString() << "\r\n";

    const char *responseJson = rest.fullRequestNoBody("GET",sbPath.getAsString());
    if (rest.get_LastMethodSuccess() != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    std::cout << responseJson << "\r\n";
    std::cout << "----" << "\r\n";
    }