Diff: source/main-https-chunked-request.cpp

Revision:

25:a8be9f3a530c

Child:

29:5ad8f931e4ff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/main-https-chunked-request.cpp	Thu Jan 11 14:39:11 2018 +0100
@@ -0,0 +1,101 @@
+/**
+ * This is an example of doing chunked requests, where you do not need to load the full request body
+ * into memory. You do this by adding a callback to the `send` function of the HTTP/HTTPS request.
+ */
+
+#include "select-demo.h"
+
+#if DEMO == DEMO_HTTPS_CHUNKED_REQUEST
+
+#include "mbed.h"
+#include "https_request.h"
+#include "easy-connect.h"
+
+Serial pc(USBTX, USBRX);
+
+/* List of trusted root CA certificates
+ * currently one: Comodo, the CA for reqres.in
+ *
+ * To add more root certificates, just concatenate them.
+ */
+const char SSL_CA_PEM[] = "-----BEGIN CERTIFICATE-----\n"
+    "MIICiTCCAg+gAwIBAgIQH0evqmIAcFBUTAGem2OZKjAKBggqhkjOPQQDAzCBhTEL\n"
+    "MAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UE\n"
+    "BxMHU2FsZm9yZDEaMBgGA1UEChMRQ09NT0RPIENBIExpbWl0ZWQxKzApBgNVBAMT\n"
+    "IkNPTU9ETyBFQ0MgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwHhcNMDgwMzA2MDAw\n"
+    "MDAwWhcNMzgwMTE4MjM1OTU5WjCBhTELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdy\n"
+    "ZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgGA1UEChMRQ09N\n"
+    "T0RPIENBIExpbWl0ZWQxKzApBgNVBAMTIkNPTU9ETyBFQ0MgQ2VydGlmaWNhdGlv\n"
+    "biBBdXRob3JpdHkwdjAQBgcqhkjOPQIBBgUrgQQAIgNiAAQDR3svdcmCFYX7deSR\n"
+    "FtSrYpn1PlILBs5BAH+X4QokPB0BBO490o0JlwzgdeT6+3eKKvUDYEs2ixYjFq0J\n"
+    "cfRK9ChQtP6IHG4/bC8vCVlbpVsLM5niwz2J+Wos77LTBumjQjBAMB0GA1UdDgQW\n"
+    "BBR1cacZSBm8nZ3qQUfflMRId5nTeTAOBgNVHQ8BAf8EBAMCAQYwDwYDVR0TAQH/\n"
+    "BAUwAwEB/zAKBggqhkjOPQQDAwNoADBlAjEA7wNbeqy3eApyt4jf/7VGFAkK+qDm\n"
+    "fQjGGoe9GKhzvSbKYAydzpmfz1wPMOG+FDHqAjAU9JM8SaczepBGR7NjfRObTrdv\n"
+    "GDeAU/7dIOA1mjbRxwG55tzd8/8dLDoWV9mSOdY=\n"
+    "-----END CERTIFICATE-----\n";
+
+void dump_response(HttpResponse* res) {
+    mbedtls_printf("Status: %d - %s\n", res->get_status_code(), res->get_status_message().c_str());
+
+    mbedtls_printf("Headers:\n");
+    for (size_t ix = 0; ix < res->get_headers_length(); ix++) {
+        mbedtls_printf("\t%s: %s\n", res->get_headers_fields()[ix]->c_str(), res->get_headers_values()[ix]->c_str());
+    }
+    mbedtls_printf("\nBody (%d bytes):\n\n%s\n", res->get_body_length(), res->get_body_as_string().c_str());
+}
+
+// Spread the message out over 3 different chunks
+const char * chunks[] = {
+    "{\"message\":",
+    "\"this is an example",
+    " of chunked encoding\"}"
+};
+
+int chunk_ix = 0;
+
+// Callback function, grab the next chunk and return it
+const void * get_chunk(size_t* out_size) {
+    // If you don't have any data left, set out_size to 0 and return a null pointer
+    if (chunk_ix == (sizeof(chunks) / sizeof(chunks[0]))) {
+        *out_size = 0;
+        return NULL;
+    }
+    const char *chunk = chunks[chunk_ix];
+    *out_size = strlen(chunk);
+    chunk_ix++;
+
+    return chunk;
+}
+
+int main() {
+    pc.baud(115200);
+
+    NetworkInterface* network = easy_connect(true);
+    if (!network) {
+        return 1;
+    }
+
+    // POST request to httpbin.org
+    {
+        HttpsRequest* post_req = new HttpsRequest(network, SSL_CA_PEM, HTTP_POST, "https://reqres.in/api/users");
+        post_req->set_debug(true);
+        post_req->set_header("Content-Type", "application/json");
+
+        // If you pass a callback here, the Transfer-Encoding header is automatically set to chunked
+        HttpResponse* post_res = post_req->send(&get_chunk);
+        if (!post_res) {
+            printf("HttpsRequest failed (error code %d)\n", post_req->get_error());
+            return 1;
+        }
+
+        printf("\n----- HTTPS POST response -----\n");
+        dump_response(post_res);
+
+        delete post_req;
+    }
+
+    wait(osWaitForever);
+}
+
+#endif