http_request.h

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#pragma once
 
#include <list>
#include <memory>
#include <set>
#include <utility>
#include <vector>
 
#include "esphome/components/json/json_util.h"
#include "esphome/core/application.h"
#include "esphome/core/automation.h"
#include "esphome/core/component.h"
#include "esphome/core/defines.h"
#include "esphome/core/alloc_helpers.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
 
namespace esphome::http_request {
 
struct Header {
  std::string name;
  std::string value;
};
 
// Some common HTTP status codes
enum HttpStatus {
  HTTP_STATUS_OK = 200,
  HTTP_STATUS_NO_CONTENT = 204,
  HTTP_STATUS_RESET_CONTENT = 205,
  HTTP_STATUS_PARTIAL_CONTENT = 206,
 
  /* 3xx - Redirection */
  HTTP_STATUS_MULTIPLE_CHOICES = 300,
  HTTP_STATUS_MOVED_PERMANENTLY = 301,
  HTTP_STATUS_FOUND = 302,
  HTTP_STATUS_SEE_OTHER = 303,
  HTTP_STATUS_NOT_MODIFIED = 304,
  HTTP_STATUS_TEMPORARY_REDIRECT = 307,
  HTTP_STATUS_PERMANENT_REDIRECT = 308,
 
  /* 4XX - CLIENT ERROR */
  HTTP_STATUS_BAD_REQUEST = 400,
  HTTP_STATUS_UNAUTHORIZED = 401,
  HTTP_STATUS_FORBIDDEN = 403,
  HTTP_STATUS_NOT_FOUND = 404,
  HTTP_STATUS_METHOD_NOT_ALLOWED = 405,
  HTTP_STATUS_NOT_ACCEPTABLE = 406,
  HTTP_STATUS_LENGTH_REQUIRED = 411,
 
  /* 5xx - Server Error */
  HTTP_STATUS_INTERNAL_ERROR = 500
};
 
inline bool is_redirect(int const status) {
  switch (status) {
    case HTTP_STATUS_MOVED_PERMANENTLY:
    case HTTP_STATUS_FOUND:
    case HTTP_STATUS_SEE_OTHER:
    case HTTP_STATUS_TEMPORARY_REDIRECT:
    case HTTP_STATUS_PERMANENT_REDIRECT:
      return true;
    default:
      return false;
  }
}
 
inline bool is_success(int const status) { return status >= HTTP_STATUS_OK && status < HTTP_STATUS_MULTIPLE_CHOICES; }
 
inline bool should_collect_header(const std::vector<std::string> &lower_case_collect_headers,
                                  const std::string &lower_header_name) {
  for (const auto &h : lower_case_collect_headers) {
    if (h == lower_header_name)
      return true;
  }
  return false;
}
 
/*
 * HTTP Container Read Semantics
 * =============================
 *
 * IMPORTANT: These semantics differ from standard BSD sockets!
 *
 * BSD socket read() returns:
 *   > 0: bytes read
 *   == 0: connection closed (EOF)
 *   < 0: error (check errno)
 *
 * HttpContainer::read() returns:
 *   > 0: bytes read successfully
 *   == 0: no data available yet OR all content read
 *         (caller should check bytes_read vs content_length)
 *   < 0: error or connection closed (caller should EXIT)
 *        HTTP_ERROR_CONNECTION_CLOSED (-1) = connection closed prematurely
 *        other negative values = platform-specific errors
 *
 * Platform behaviors:
 *   - ESP-IDF: blocking reads, 0 only returned when all content read
 *   - Arduino: non-blocking, 0 means "no data yet" or "all content read"
 *
 * Chunked responses that complete in a reasonable time work correctly on both
 * platforms. The limitation below applies only to *streaming* chunked
 * responses where data arrives slowly over a long period.
 *
 * Streaming chunked responses are NOT supported (all platforms):
 *   The read helpers (http_read_loop_result, http_read_fully) block the main
 *   event loop until all response data is received. For streaming responses
 *   where data trickles in slowly (e.g., TTS streaming via ffmpeg proxy),
 *   this starves the event loop on both ESP-IDF and Arduino. If data arrives
 *   just often enough to avoid the caller's timeout, the loop runs
 *   indefinitely. If data stops entirely, ESP-IDF fails with
 *   -ESP_ERR_HTTP_EAGAIN (transport timeout) while Arduino spins with
 *   delay(1) until the caller's timeout fires. Supporting streaming requires
 *   a non-blocking incremental read pattern that yields back to the event
 *   loop between chunks. Components that need streaming should use
 *   esp_http_client directly on a separate FreeRTOS task with
 *   esp_http_client_is_complete_data_received() for completion detection
 *   (see audio_reader.cpp for an example).
 *
 * Chunked transfer encoding - platform differences:
 *   - ESP-IDF HttpContainer:
 *       HttpContainerIDF overrides is_read_complete() to call
 *       esp_http_client_is_complete_data_received(), which is the
 *       authoritative completion check for both chunked and non-chunked
 *       transfers. When esp_http_client_read() returns 0 for a completed
 *       chunked response, read() returns 0 and is_read_complete() returns
 *       true, so callers get COMPLETE from http_read_loop_result().
 *
 *   - Arduino HttpContainer:
 *       Chunked responses are decoded internally (see
 *       HttpContainerArduino::read_chunked_()). When the final chunk arrives,
 *       is_chunked_ is cleared and content_length is set to bytes_read_.
 *       Completion is then detected via is_read_complete(), and a subsequent
 *       read() returns 0 to indicate "all content read" (not
 *       HTTP_ERROR_CONNECTION_CLOSED).
 *
 * Use the helper functions below instead of checking return values directly:
 *   - http_read_loop_result(): for manual loops with per-chunk processing
 *   - http_read_fully(): for simple "read N bytes into buffer" operations
 */
 
static constexpr int HTTP_ERROR_CONNECTION_CLOSED = -1;
 
enum class HttpReadStatus : uint8_t {
  OK,       
  ERROR,    
  TIMEOUT,  
};
 
struct HttpReadResult {
  HttpReadStatus status;  
  int error_code;         
};
 
enum class HttpReadLoopResult : uint8_t {
  DATA,      
  COMPLETE,  
  RETRY,     
  ERROR,     
  TIMEOUT,   
};
 
inline HttpReadLoopResult http_read_loop_result(int bytes_read_or_error, uint32_t &last_data_time, uint32_t timeout_ms,
                                                bool is_read_complete) {
  if (bytes_read_or_error > 0) {
    last_data_time = millis();
    return HttpReadLoopResult::DATA;
  }
  if (bytes_read_or_error < 0) {
    return HttpReadLoopResult::ERROR;
  }
  // bytes_read_or_error == 0: either "no data yet" or "all content read"
  if (is_read_complete) {
    return HttpReadLoopResult::COMPLETE;
  }
  if (millis() - last_data_time >= timeout_ms) {
    return HttpReadLoopResult::TIMEOUT;
  }
  delay(1);  // Small delay to prevent tight spinning
  return HttpReadLoopResult::RETRY;
}
 
class HttpRequestComponent;
 
class HttpContainer : public Parented<HttpRequestComponent> {
 public:
  virtual ~HttpContainer() = default;
  size_t content_length{0};
  int status_code{-1};  
  uint32_t duration_ms{0};
 
  virtual int read(uint8_t *buf, size_t max_len) = 0;
  virtual void end() = 0;
 
  void set_secure(bool secure) { this->secure_ = secure; }
  void set_chunked(bool chunked) { this->is_chunked_ = chunked; }
 
  size_t get_bytes_read() const { return this->bytes_read_; }
 
  virtual bool is_read_complete() const {
    // Per RFC 9112, these responses have no body:
    // - 1xx (Informational), 204 No Content, 205 Reset Content, 304 Not Modified
    if ((this->status_code >= 100 && this->status_code < 200) || this->status_code == HTTP_STATUS_NO_CONTENT ||
        this->status_code == HTTP_STATUS_RESET_CONTENT || this->status_code == HTTP_STATUS_NOT_MODIFIED) {
      return true;
    }
    // For non-chunked responses, complete when bytes_read >= content_length
    // This handles both Content-Length: 0 and Content-Length: N cases
    return !this->is_chunked_ && this->bytes_read_ >= this->content_length;
  }
 
  std::string get_response_header(const std::string &header_name);
 
 protected:
  size_t bytes_read_{0};
  bool secure_{false};
  bool is_chunked_{false};  
  std::vector<Header> response_headers_{};
};
 
inline HttpReadResult http_read_fully(HttpContainer *container, uint8_t *buffer, size_t total_size, size_t chunk_size,
                                      uint32_t timeout_ms) {
  size_t read_index = 0;
  uint32_t last_data_time = millis();
 
  while (read_index < total_size) {
    int read_bytes_or_error = container->read(buffer + read_index, std::min(chunk_size, total_size - read_index));
 
    App.feed_wdt();
    yield();
 
    auto result = http_read_loop_result(read_bytes_or_error, last_data_time, timeout_ms, container->is_read_complete());
    if (result == HttpReadLoopResult::RETRY)
      continue;
    if (result == HttpReadLoopResult::COMPLETE)
      break;  // Server sent less data than requested, but transfer is complete
    if (result == HttpReadLoopResult::ERROR)
      return {HttpReadStatus::ERROR, read_bytes_or_error};
    if (result == HttpReadLoopResult::TIMEOUT)
      return {HttpReadStatus::TIMEOUT, 0};
 
    read_index += read_bytes_or_error;
  }
  return {HttpReadStatus::OK, 0};
}
 
class HttpRequestResponseTrigger : public Trigger<std::shared_ptr<HttpContainer>, std::string &> {
 public:
  void process(const std::shared_ptr<HttpContainer> &container, std::string &response_body) {
    this->trigger(container, response_body);
  }
};
 
class HttpRequestComponent : public Component {
 public:
  void dump_config() override;
  float get_setup_priority() const override { return setup_priority::AFTER_WIFI; }
 
  void set_useragent(const char *useragent) { this->useragent_ = useragent; }
  void set_timeout(uint32_t timeout) { this->timeout_ = timeout; }
  uint32_t get_timeout() const { return this->timeout_; }
  void set_watchdog_timeout(uint32_t watchdog_timeout) { this->watchdog_timeout_ = watchdog_timeout; }
  uint32_t get_watchdog_timeout() const { return this->watchdog_timeout_; }
  void set_follow_redirects(bool follow_redirects) { this->follow_redirects_ = follow_redirects; }
  void set_redirect_limit(uint16_t limit) { this->redirect_limit_ = limit; }
 
  std::shared_ptr<HttpContainer> get(const std::string &url) {
    return this->start(url, "GET", "", std::vector<Header>{});
  }
  std::shared_ptr<HttpContainer> get(const std::string &url, const std::vector<Header> &request_headers) {
    return this->start(url, "GET", "", request_headers);
  }
  std::shared_ptr<HttpContainer> get(const std::string &url, const std::vector<Header> &request_headers,
                                     const std::vector<std::string> &lower_case_collect_headers) {
    return this->start(url, "GET", "", request_headers, lower_case_collect_headers);
  }
  std::shared_ptr<HttpContainer> post(const std::string &url, const std::string &body) {
    return this->start(url, "POST", body, std::vector<Header>{});
  }
  std::shared_ptr<HttpContainer> post(const std::string &url, const std::string &body,
                                      const std::vector<Header> &request_headers) {
    return this->start(url, "POST", body, request_headers);
  }
  std::shared_ptr<HttpContainer> post(const std::string &url, const std::string &body,
                                      const std::vector<Header> &request_headers,
                                      const std::vector<std::string> &lower_case_collect_headers) {
    return this->start(url, "POST", body, request_headers, lower_case_collect_headers);
  }
 
  // Remove before 2027.1.0
  ESPDEPRECATED("Pass request_headers as std::vector<Header> instead of std::list. Removed in 2027.1.0.", "2026.7.0")
  std::shared_ptr<HttpContainer> get(const std::string &url, const std::list<Header> &request_headers) {
    return this->get(url, std::vector<Header>(request_headers.begin(), request_headers.end()));
  }
  // Remove before 2027.1.0
  ESPDEPRECATED("Pass request_headers as std::vector<Header> instead of std::list. Removed in 2027.1.0.", "2026.7.0")
  std::shared_ptr<HttpContainer> get(const std::string &url, const std::list<Header> &request_headers,
                                     const std::vector<std::string> &collect_headers) {
    return this->get(url, std::vector<Header>(request_headers.begin(), request_headers.end()), collect_headers);
  }
  // Remove before 2027.1.0
  ESPDEPRECATED("Pass request_headers as std::vector<Header> instead of std::list. Removed in 2027.1.0.", "2026.7.0")
  std::shared_ptr<HttpContainer> post(const std::string &url, const std::string &body,
                                      const std::list<Header> &request_headers) {
    return this->post(url, body, std::vector<Header>(request_headers.begin(), request_headers.end()));
  }
  // Remove before 2027.1.0
  ESPDEPRECATED("Pass request_headers as std::vector<Header> instead of std::list. Removed in 2027.1.0.", "2026.7.0")
  std::shared_ptr<HttpContainer> post(const std::string &url, const std::string &body,
                                      const std::list<Header> &request_headers,
                                      const std::vector<std::string> &collect_headers) {
    return this->post(url, body, std::vector<Header>(request_headers.begin(), request_headers.end()), collect_headers);
  }
 
  std::shared_ptr<HttpContainer> start(const std::string &url, const std::string &method, const std::string &body,
                                       const std::vector<Header> &request_headers) {
    // Call perform() directly to avoid ambiguity with the deprecated overloads
    return this->perform(url, method, body, request_headers, {});
  }
 
  // Remove before 2027.1.0
  ESPDEPRECATED("Pass request_headers as std::vector<Header> instead of std::list. Removed in 2027.1.0.", "2026.7.0")
  std::shared_ptr<HttpContainer> start(const std::string &url, const std::string &method, const std::string &body,
                                       const std::list<Header> &request_headers) {
    return this->start(url, method, body, std::vector<Header>(request_headers.begin(), request_headers.end()));
  }
 
  // Remove before 2027.1.0
  ESPDEPRECATED("Pass collect_headers as std::vector<std::string> instead of std::set. Removed in 2027.1.0.",
                "2026.7.0")
  std::shared_ptr<HttpContainer> start(const std::string &url, const std::string &method, const std::string &body,
                                       const std::vector<Header> &request_headers,
                                       const std::set<std::string> &collect_headers) {
    std::vector<std::string> lower;
    lower.reserve(collect_headers.size());
    for (const auto &h : collect_headers) {
      lower.push_back(str_lower_case(h));  // NOLINT
    }
    return this->perform(url, method, body, request_headers, lower);
  }
 
  // Remove before 2027.1.0
  ESPDEPRECATED("Pass request_headers as std::vector<Header> instead of std::list, and collect_headers as "
                "std::vector<std::string> instead of std::set. Removed in 2027.1.0.",
                "2026.7.0")
  std::shared_ptr<HttpContainer> start(const std::string &url, const std::string &method, const std::string &body,
                                       const std::list<Header> &request_headers,
                                       const std::set<std::string> &collect_headers) {
    std::vector<std::string> lower;
    lower.reserve(collect_headers.size());
    for (const auto &h : collect_headers) {
      lower.push_back(str_lower_case(h));  // NOLINT
    }
    return this->perform(url, method, body, std::vector<Header>(request_headers.begin(), request_headers.end()), lower);
  }
 
  // Remove before 2027.1.0
  ESPDEPRECATED("Pass request_headers as std::vector<Header> instead of std::list. Removed in 2027.1.0.", "2026.7.0")
  std::shared_ptr<HttpContainer> start(const std::string &url, const std::string &method, const std::string &body,
                                       const std::list<Header> &request_headers,
                                       const std::vector<std::string> &lower_case_collect_headers) {
    return this->perform(url, method, body, std::vector<Header>(request_headers.begin(), request_headers.end()),
                         lower_case_collect_headers);
  }
 
  std::shared_ptr<HttpContainer> start(const std::string &url, const std::string &method, const std::string &body,
                                       const std::vector<Header> &request_headers,
                                       const std::vector<std::string> &lower_case_collect_headers) {
    return this->perform(url, method, body, request_headers, lower_case_collect_headers);
  }
 
 protected:
  virtual std::shared_ptr<HttpContainer> perform(const std::string &url, const std::string &method,
                                                 const std::string &body, const std::vector<Header> &request_headers,
                                                 const std::vector<std::string> &lower_case_collect_headers) = 0;
  const char *useragent_{nullptr};
  bool follow_redirects_{};
  uint16_t redirect_limit_{};
  uint32_t timeout_{4500};
  uint32_t watchdog_timeout_{0};
};
 
template<typename... Ts> class HttpRequestSendAction : public Action<Ts...> {
 public:
  HttpRequestSendAction(HttpRequestComponent *parent) : parent_(parent) {}
  TEMPLATABLE_VALUE(std::string, url)
  TEMPLATABLE_VALUE(const char *, method)
  TEMPLATABLE_VALUE(std::string, body)
#ifdef USE_HTTP_REQUEST_RESPONSE
  TEMPLATABLE_VALUE(bool, capture_response)
#endif
 
  void init_request_headers(size_t count) { this->request_headers_.init(count); }
  void add_request_header(const char *key, TemplatableFn<const char *, Ts...> value) {
    this->request_headers_.push_back({key, value});
  }
 
  void add_collect_header(const char *value) { this->lower_case_collect_headers_.emplace_back(value); }
 
  void init_json(size_t count) { this->json_.init(count); }
  void add_json(const char *key, TemplatableValue<std::string, Ts...> value) { this->json_.push_back({key, value}); }
 
  void set_json(std::function<void(Ts..., JsonObject)> json_func) { this->json_func_ = json_func; }
 
#ifdef USE_HTTP_REQUEST_RESPONSE
  Trigger<std::shared_ptr<HttpContainer>, std::string &, Ts...> *get_success_trigger_with_response() {
    return &this->success_trigger_with_response_;
  }
#endif
  Trigger<std::shared_ptr<HttpContainer>, Ts...> *get_success_trigger() { return &this->success_trigger_; }
 
  Trigger<Ts...> *get_error_trigger() { return &this->error_trigger_; }
 
  void set_max_response_buffer_size(size_t max_response_buffer_size) {
    this->max_response_buffer_size_ = max_response_buffer_size;
  }
 
  void play(const Ts &...x) override {
    std::string body;
    if (this->body_.has_value()) {
      body = this->body_.value(x...);
    }
    if (!this->json_.empty()) {
      body = json::build_json([this, x...](JsonObject root) { this->encode_json_(x..., root); });
    }
    if (this->json_func_ != nullptr) {
      body = json::build_json([this, x...](JsonObject root) { this->json_func_(x..., root); });
    }
    std::vector<Header> request_headers;
    request_headers.reserve(this->request_headers_.size());
    for (const auto &[key, val] : this->request_headers_) {
      request_headers.push_back({key, val.value(x...)});
    }
 
    auto container = this->parent_->start(this->url_.value(x...), this->method_.value(x...), body, request_headers,
                                          this->lower_case_collect_headers_);
 
    auto captured_args = std::make_tuple(x...);
 
    if (container == nullptr) {
      std::apply([this](Ts... captured_args_inner) { this->error_trigger_.trigger(captured_args_inner...); },
                 captured_args);
      return;
    }
 
    size_t max_length = this->max_response_buffer_size_;
#ifdef USE_HTTP_REQUEST_RESPONSE
    if (this->capture_response_.value(x...)) {
      std::string response_body;
      RAMAllocator<uint8_t> allocator;
      uint8_t *buf = allocator.allocate(max_length);
      if (buf != nullptr) {
        // NOTE: HttpContainer::read() has non-BSD socket semantics - see top of this file
        // Use http_read_loop_result() helper instead of checking return values directly
        size_t read_index = 0;
        uint32_t last_data_time = millis();
        const uint32_t read_timeout = this->parent_->get_timeout();
        while (container->get_bytes_read() < max_length) {
          int read_or_error = container->read(buf + read_index, std::min<size_t>(max_length - read_index, 512));
          App.feed_wdt();
          yield();
          auto result =
              http_read_loop_result(read_or_error, last_data_time, read_timeout, container->is_read_complete());
          if (result == HttpReadLoopResult::RETRY)
            continue;
          if (result != HttpReadLoopResult::DATA)
            break;  // COMPLETE, ERROR, or TIMEOUT
          read_index += read_or_error;
        }
        response_body.reserve(read_index);
        response_body.assign((char *) buf, read_index);
        allocator.deallocate(buf, max_length);
      }
      std::apply(
          [this, &container, &response_body](Ts... captured_args_inner) {
            this->success_trigger_with_response_.trigger(container, response_body, captured_args_inner...);
          },
          captured_args);
    } else
#endif
    {
      std::apply([this, &container](
                     Ts... captured_args_inner) { this->success_trigger_.trigger(container, captured_args_inner...); },
                 captured_args);
    }
    container->end();
  }
 
 protected:
  void encode_json_(Ts... x, JsonObject root) {
    for (const auto &item : this->json_) {
      auto val = item.second;
      root[item.first] = val.value(x...);
    }
  }
  HttpRequestComponent *parent_;
  FixedVector<std::pair<const char *, TemplatableFn<const char *, Ts...>>> request_headers_{};
  std::vector<std::string> lower_case_collect_headers_{"content-type", "content-length"};
  FixedVector<std::pair<const char *, TemplatableValue<std::string, Ts...>>> json_{};
  std::function<void(Ts..., JsonObject)> json_func_{nullptr};
#ifdef USE_HTTP_REQUEST_RESPONSE
  Trigger<std::shared_ptr<HttpContainer>, std::string &, Ts...> success_trigger_with_response_;
#endif
  Trigger<std::shared_ptr<HttpContainer>, Ts...> success_trigger_;
  Trigger<Ts...> error_trigger_;
 
  size_t max_response_buffer_size_{SIZE_MAX};
};
 
}  // namespace esphome::http_request