feat: guess content-type for external bodies

Author: boltlessengineer

lua/rest-nvim/autocmds.lua

@@ -73,7 +73,10 @@ function autocmds.setup()
                         req.headers["content-type"] = { "application/json" }
                     elseif req.body.__TYPE == "xml" then
                         req.headers["content-type"] = { "application/xml" }
-                        -- TODO: auto-set content-type header for external body
+                    elseif req.body.__TYPE == "external" then
+                        local mimetypes = require("mimetypes")
+                        local body_mimetype = mimetypes.guess(req.body.data.path)
+                        req.headers["content-type"] = { body_mimetype }
                     end
                 end
             end

spec/examples/examples_spec.lua

@@ -103,3 +103,20 @@ describe("pre-request script", function()
         assert.same("https://jsonplaceholder.typicode.com/posts/", req2.url)
     end)
 end)
+
+describe("builtin request hooks", function ()
+    describe("set_content_type", function ()
+        it("with external body", function ()
+            local source = open("spec/examples/post_with_external_body.http")
+            local _, tree = utils.ts_parse_source(source)
+            local req_node = assert(tree:root():child(0))
+            local req = assert(parser.parse(req_node, source))
+            _G.rest_request = req
+            vim.api.nvim_exec_autocmds("User", {
+                pattern = { "RestRequest", "RestRequestPre" },
+            })
+            _G.rest_request = nil
+            assert.same({ "application/json" }, req.headers["content-type"])
+        end)
+    end)
+end)

spec/examples/post_with_external_body.http

@@ -1,5 +1,5 @@
-// The request body is read from a file
+### The request body is read from a file
 POST https://example.com:8080/api/html/post
-Content-Type: application/json
+# rest.nvim can guess the Content-Type from file path
 
 < ./input.json

spec/parser/http_parser_spec.lua

@@ -190,12 +190,10 @@ key5 = value5
             assert.same({
                 method = "POST",
                 url = "https://example.com:8080/api/html/post",
-                headers = {
-                    ["content-type"] = { "application/json" },
-                },
+                headers = {},
                 cookies = {},
                 handlers = {},
-                name = "post_with_external_body#1",
+                name = "The request body is read from a file",
                 body = {
                     __TYPE = "external",
                     data = {