rest_xml support, minus s3

README.md

@@ -2,8 +2,7 @@
 
 [![Build Status](https://drone.lerch.org/api/badges/lobo/aws-sdk-for-zig/status.svg?ref=refs/heads/master)](https://drone.lerch.org/api/badges/lobo/aws-sdk-for-zig/)
 
-This SDK currently supports all AWS services. restXml protocol support (4
-services including S3), is still new, with lots of gaps. See TODO list below.
+This SDK currently supports all AWS services except S3. See TODO list below.
 
 Current executable size for the demo is 1.7M (90k of which is the AWS PEM file,
 and approximately 600K for XML services) after compiling with -Drelease-safe and
@@ -43,14 +42,15 @@ for posterity, and supports x86_64 linux. The old branch is deprecated.
 
 ## Limitations
 
-There are many nuances of AWS V4 signature calculation. Parts of S3 are not supported
-because it uses many of these test cases. WebIdentityToken is not yet
-implemented.
+There are many nuances of AWS V4 signature calculation. S3 is not supported
+because it uses many of these edge cases. Also endpoint calculation is special
+for S3. WebIdentityToken is not yet implemented.
 
 TODO List:
 
-* Complete development of [AWS restXml protocol](https://awslabs.github.io/smithy/1.0/spec/aws/aws-restxml-protocol.html).
-  Includes S3. Total service count 4.
+* Implement initial S3 support. This involves:
+  * Implementation of AWS SigV4 signature calculation for S3, which is unique
+  * Implementation of S3 endpoint calculation, which is also unique to this service
 * Bump to zig 0.9.1. iguanaTLS, used in zFetch is still [working out 0.9.1 issues](https://github.com/alexnask/iguanaTLS/pull/29)
 * Implement sigv4a signing
 * Implement jitter/exponential backoff

src/aws.zig

@@ -268,6 +268,13 @@ pub fn Request(comptime action: anytype) type {
             else
                 ServerResponse(action);
 
+            const NullType: type = u0; // This is a small hack, yes...
+            const SRawResponse = if (Self.service_meta.aws_protocol != .query and
+                std.meta.fields(SResponse).len == 1)
+                std.meta.fields(SResponse)[0].field_type
+            else
+                NullType;
+
             const parser_options = json.ParseOptions{
                 .allocator = options.client.allocator,
                 .allow_camel_case_conversion = true, // new option
@@ -288,22 +295,61 @@ pub fn Request(comptime action: anytype) type {
 
             var stream = json.TokenStream.init(response.body);
 
-            const parsed_response = json.parse(SResponse, &stream, parser_options) catch |e| {
-                log.err(
-                    \\Call successful, but unexpected response from service.
-                    \\This could be the result of a bug or a stale set of code generated
-                    \\service models.
-                    \\
-                    \\Model Type: {s}
-                    \\
-                    \\Response from server:
-                    \\
-                    \\{s}
-                    \\
-                , .{ SResponse, response.body });
-                return e;
+            const start = std.mem.indexOf(u8, response.body, "\"") orelse 0; // Should never be 0
+            if (start == 0) log.warn("Response body missing json key?!", .{});
+            var end = std.mem.indexOf(u8, response.body[start + 1 ..], "\"") orelse 0;
+            if (end == 0) log.warn("Response body only has one double quote?!", .{});
+            end = end + start + 1;
+
+            const key = response.body[start + 1 .. end];
+            log.debug("First json key: {s}", .{key});
+            const foundNormalJsonResponse = std.mem.eql(u8, key, action.action_name ++ "Response");
+            const parsed_response_ptr = blk: {
+                if (SRawResponse == NullType or foundNormalJsonResponse)
+                    break :blk &(json.parse(SResponse, &stream, parser_options) catch |e| {
+                        log.err(
+                            \\Call successful, but unexpected response from service.
+                            \\This could be the result of a bug or a stale set of code generated
+                            \\service models.
+                            \\
+                            \\Model Type: {s}
+                            \\
+                            \\Response from server:
+                            \\
+                            \\{s}
+                            \\
+                        , .{ SResponse, response.body });
+                        return e;
+                    });
+
+                log.debug("Appears server has provided a raw response", .{});
+                const ptr = try options.client.allocator.create(SResponse);
+                @field(ptr.*, std.meta.fields(SResponse)[0].name) =
+                    json.parse(SRawResponse, &stream, parser_options) catch |e| {
+                    log.err(
+                        \\Call successful, but unexpected response from service.
+                        \\This could be the result of a bug or a stale set of code generated
+                        \\service models.
+                        \\
+                        \\Model Type: {s}
+                        \\
+                        \\Response from server:
+                        \\
+                        \\{s}
+                        \\
+                    , .{ SResponse, response.body });
+                    return e;
+                };
+                break :blk ptr;
             };
 
+            // This feels like it should result in a use after free, but it
+            // seems to be working?
+            defer if (!(SRawResponse == NullType or foundNormalJsonResponse))
+                options.client.allocator.destroy(parsed_response_ptr);
+
+            const parsed_response = parsed_response_ptr.*;
+
             // TODO: Figure out this hack
             // the code setting the response about 10 lines down will trigger
             // an error because the first field may not be a struct when

src/main.zig

@@ -49,6 +49,7 @@ const Tests = enum {
     rest_json_1_query_with_input,
     rest_json_1_work_with_lambda,
     rest_xml_no_input,
+    rest_xml_anything_but_s3,
 };
 
 pub fn main() anyerror!void {
@@ -89,7 +90,7 @@ pub fn main() anyerror!void {
     };
     defer client.deinit();
 
-    const services = aws.Services(.{ .sts, .ec2, .dynamo_db, .ecs, .lambda, .sqs, .s3 }){};
+    const services = aws.Services(.{ .sts, .ec2, .dynamo_db, .ecs, .lambda, .sqs, .s3, .cloudfront }){};
 
     for (tests.items) |t| {
         std.log.info("===== Start Test: {s} =====", .{@tagName(t)});
@@ -221,6 +222,14 @@ pub fn main() anyerror!void {
                 std.log.info("request id: {s}", .{result.response_metadata.request_id});
                 std.log.info("bucket count: {d}", .{result.response.buckets.?.len});
             },
+            .rest_xml_anything_but_s3 => {
+                const result = try client.call(services.cloudfront.list_key_groups.Request{}, options);
+                defer result.deinit();
+                std.log.info("request id: {s}", .{result.response_metadata.request_id});
+                const list = result.response.key_group_list.?;
+                std.log.info("key group list max: {d}", .{list.max_items});
+                std.log.info("key group quantity: {d}", .{list.quantity});
+            },
         }
         std.log.info("===== End Test: {s} =====\n", .{@tagName(t)});
     }