quick_rest: can set http headers for request

lua/qr.example.lua

@@ -7,10 +7,10 @@ local qr = require "quick_rest"
 --}
 
 local request = qr.request.post("https://api.internal.insiders.cloud/1/rest/accounts/authentication/requesttoken")
---    .json {
---        username = "klara@bpa.de",
---        password = "abcdedf"
---    }
---
---
+    :json {
+        username = "klara@bpa.de",
+        password = "abcdedf"
+    }
+
+
 print(request)

lua_modules/quick_rest/src/http_headers.rs

@@ -0,0 +1,27 @@
+use std::collections::HashMap;
+use std::fmt::{Display, Formatter};
+
+#[derive(Clone, Default)]
+pub struct HttpHeaders {
+    map: HashMap<String, String>,
+}
+
+impl HttpHeaders {
+    pub fn add(&self, key: impl Into<String>, value: impl Into<String>) -> Self {
+        let mut result = self.clone();
+        result.map.insert(key.into(), value.into());
+        result
+    }
+}
+
+impl Display for HttpHeaders {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        if self.map.is_empty() {
+            return Ok(());
+        }
+        for (key, value) in self.map.iter() {
+            writeln!(f, "{}: {}", key, value)?;
+        }
+        writeln!(f, "")
+    }
+}

lua_modules/quick_rest/src/http_request.rs

@@ -1,3 +1,4 @@
+use crate::http_headers::HttpHeaders;
 use crate::http_request_body::HttpRequestBody;
 use reqwest::Url;
 use std::fmt::{Display, Formatter};
@@ -6,6 +7,7 @@ use std::fmt::{Display, Formatter};
 pub struct HttpRequest {
     method: HttpMethod,
     url: Url,
+    headers: HttpHeaders,
 }
 
 #[derive(Clone)]
@@ -15,7 +17,9 @@ pub enum HttpMethod {
 
 impl Display for HttpRequest {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        write!(f, "<HttpRequest> {} {}", self.method, self.url)
+        writeln!(f, "<HttpRequest> {} {}", self.method, self.url)?;
+        writeln!(f, "{}", self.headers)?;
+        Ok(())
     }
 }
 
@@ -38,6 +42,7 @@ impl HttpRequest {
         HttpRequest {
             method: HttpMethod::POST,
             url,
+            headers: Default::default(),
         }
     }
     pub fn patch() -> HttpRequest {
@@ -58,8 +63,10 @@ impl HttpRequest {
     pub fn add_query_param(&self, key: String, value: String) -> HttpRequest {
         todo!()
     }
-    pub fn add_header(&self, key: String, value: String) -> HttpRequest {
-        todo!()
+    pub fn add_header(&self, key: impl Into<String>, value: impl Into<String>) -> HttpRequest {
+        let mut result = self.clone();
+        result.headers = result.headers.add(key, value);
+        result
     }
 
     pub fn body(&self, body: HttpRequestBody) -> HttpRequest {

lua_modules/quick_rest/src/lib.rs

@@ -9,3 +9,4 @@ mod http_service_builder;
 mod http_service_wrapper;
 mod lua_bindings;
 mod network_error;
+mod http_headers;

lua_modules/quick_rest/src/lua_bindings/lua_http_request.rs

@@ -1,10 +1,14 @@
 use crate::http_request::HttpRequest;
-use mlua::{MetaMethod, UserData, UserDataMethods};
+use mlua::{MetaMethod, UserData, UserDataMethods, Value};
 
 impl UserData for HttpRequest {
     fn add_methods<'lua, M: UserDataMethods<'lua, Self>>(methods: &mut M) {
         methods.add_meta_method(MetaMethod::ToString, |_, http_request, _: ()| {
             Ok(http_request.to_string())
-        })
+        });
+        methods.add_method("json", |lua, http_request, value: Value| {
+            let http_request = http_request.add_header("Content-Type", "application/json");
+            Ok(http_request)
+        });
     }
 }