/* ====================================================================
 *    Licensed to the Apache Software Foundation (ASF) under one
 *    or more contributor license agreements.  See the NOTICE file
 *    distributed with this work for additional information
 *    regarding copyright ownership.  The ASF licenses this file
 *    to you under the Apache License, Version 2.0 (the
 *    "License"); you may not use this file except in compliance
 *    with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing,
 *    software distributed under the License is distributed on an
 *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *    KIND, either express or implied.  See the License for the
 *    specific language governing permissions and limitations
 *    under the License.
 * ====================================================================
 */

#ifndef SERF_BUCKET_TYPES_H
#define SERF_BUCKET_TYPES_H

#include <apr_mmap.h>
#include <apr_hash.h>

/* this header and serf.h refer to each other, so take a little extra care */
#ifndef SERF_H
#include "serf.h"
#endif


/**
 * @file serf_bucket_types.h
 * @brief serf-supported bucket types
 */
/* ### this whole file needs docco ... */

#ifdef __cplusplus
extern "C" {
#endif

/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_request;
#define SERF_BUCKET_IS_REQUEST(b) SERF_BUCKET_CHECK((b), request)

serf_bucket_t *serf_bucket_request_create(
    const char *method,
    const char *URI,
    serf_bucket_t *body,
    serf_bucket_alloc_t *allocator);

/* Send a Content-Length header with @a len. The @a body bucket should
   contain precisely that much data.  */
void serf_bucket_request_set_CL(
    serf_bucket_t *bucket,
    apr_int64_t len);

serf_bucket_t *serf_bucket_request_get_headers(
    serf_bucket_t *request);

void serf_bucket_request_become(
    serf_bucket_t *bucket,
    const char *method,
    const char *uri,
    serf_bucket_t *body);

/**
 * Sets the root url of the remote host. If this request contains a relative
 * url, it will be prefixed with the root url to form an absolute url.
 * @a bucket is the request bucket. @a root_url is the absolute url of the
 * root of the remote host, without the closing '/'.
 */
void serf_bucket_request_set_root(
    serf_bucket_t *bucket,
    const char *root_url);

/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_response;
#define SERF_BUCKET_IS_RESPONSE(b) SERF_BUCKET_CHECK((b), response)

serf_bucket_t *serf_bucket_response_create(
    serf_bucket_t *stream,
    serf_bucket_alloc_t *allocator);

#define SERF_HTTP_VERSION(major, minor)  ((major) * 1000 + (minor))
#define SERF_HTTP_11 SERF_HTTP_VERSION(1, 1)
#define SERF_HTTP_10 SERF_HTTP_VERSION(1, 0)
#define SERF_HTTP_VERSION_MAJOR(shv) ((int)shv / 1000)
#define SERF_HTTP_VERSION_MINOR(shv) ((int)shv % 1000)

typedef struct {
    int version;
    int code;
    const char *reason;
} serf_status_line;

/**
 * Return the Status-Line information, if available. This function
 * works like other bucket read functions: it may return APR_EAGAIN or
 * APR_EOF to signal the state of the bucket for reading. A return
 * value of APR_SUCCESS will always indicate that status line
 * information was returned; for other return values the caller must
 * check the version field in @a sline. A value of 0 means that the
 * data is not (yet) present.
 */
apr_status_t serf_bucket_response_status(
    serf_bucket_t *bkt,
    serf_status_line *sline);

/**
 * Wait for the HTTP headers to be processed for a @a response.
 *
 * If the headers are available, APR_SUCCESS is returned.
 * If the headers aren't available, APR_EAGAIN is returned.
 */
apr_status_t serf_bucket_response_wait_for_headers(
    serf_bucket_t *response);

/**
 * Get the headers bucket for @a response.
 */
serf_bucket_t *serf_bucket_response_get_headers(
    serf_bucket_t *response);

/**
 * Advise the response @a bucket that this was from a HEAD request and
 * that it should not expect to see a response body.
 */
void serf_bucket_response_set_head(
    serf_bucket_t *bucket);

/* ==================================================================== */

extern const serf_bucket_type_t serf_bucket_type_response_body;
#define SERF_BUCKET_IS_RESPONSE_BODY(b) SERF_BUCKET_CHECK((b), response_body)

serf_bucket_t *serf_bucket_response_body_create(
    serf_bucket_t *stream,
    apr_uint64_t limit,
    serf_bucket_alloc_t *allocator);

/* ==================================================================== */

extern const serf_bucket_type_t serf_bucket_type_bwtp_frame;
#define SERF_BUCKET_IS_BWTP_FRAME(b) SERF_BUCKET_CHECK((b), bwtp_frame)

extern const serf_bucket_type_t serf_bucket_type_bwtp_incoming_frame;
#define SERF_BUCKET_IS_BWTP_INCOMING_FRAME(b) SERF_BUCKET_CHECK((b), bwtp_incoming_frame)

int serf_bucket_bwtp_frame_get_channel(
    serf_bucket_t *hdr);

int serf_bucket_bwtp_frame_get_type(
    serf_bucket_t *hdr);

const char *serf_bucket_bwtp_frame_get_phrase(
    serf_bucket_t *hdr);

serf_bucket_t *serf_bucket_bwtp_frame_get_headers(
    serf_bucket_t *hdr);

serf_bucket_t *serf_bucket_bwtp_channel_open(
    int channel,
    const char *URI,
    serf_bucket_alloc_t *allocator);

serf_bucket_t *serf_bucket_bwtp_channel_close(
    int channel,
    serf_bucket_alloc_t *allocator);

serf_bucket_t *serf_bucket_bwtp_header_create(
    int channel,
    const char *phrase,
    serf_bucket_alloc_t *allocator);

serf_bucket_t *serf_bucket_bwtp_message_create(
    int channel,
    serf_bucket_t *body,
    serf_bucket_alloc_t *allocator);

serf_bucket_t *serf_bucket_bwtp_incoming_frame_create(
    serf_bucket_t *bkt,
    serf_bucket_alloc_t *allocator);

apr_status_t serf_bucket_bwtp_incoming_frame_wait_for_headers(
    serf_bucket_t *bkt);

/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_aggregate;
#define SERF_BUCKET_IS_AGGREGATE(b) SERF_BUCKET_CHECK((b), aggregate)

typedef apr_status_t (*serf_bucket_aggregate_eof_t)(
    void *baton,
    serf_bucket_t *aggregate_bucket);

/** serf_bucket_aggregate_cleanup will instantly destroy all buckets in
    the aggregate bucket that have been read completely. Whereas normally, 
    these buckets are destroyed on every read operation. */ 
void serf_bucket_aggregate_cleanup(
    serf_bucket_t *bucket,
    serf_bucket_alloc_t *allocator);

serf_bucket_t *serf_bucket_aggregate_create(
    serf_bucket_alloc_t *allocator);

/* Creates a stream bucket.
   A stream bucket is like an aggregate bucket, but:
   - it doesn't destroy its child buckets on cleanup
   - one can always keep adding child buckets, the handler FN should return
     APR_EOF when no more buckets will be added.

  Note: keep this factory function internal for now. If it turns out this
  bucket type is useful outside serf, we should make it an actual separate
  type.
  */
serf_bucket_t *serf__bucket_stream_create(
    serf_bucket_alloc_t *allocator,
    serf_bucket_aggregate_eof_t fn,
    void *baton);

/** Transform @a bucket in-place into an aggregate bucket. */
void serf_bucket_aggregate_become(
    serf_bucket_t *bucket);

void serf_bucket_aggregate_prepend(
    serf_bucket_t *aggregate_bucket,
    serf_bucket_t *prepend_bucket);

void serf_bucket_aggregate_append(
    serf_bucket_t *aggregate_bucket,
    serf_bucket_t *append_bucket);
    
void serf_bucket_aggregate_hold_open(
    serf_bucket_t *aggregate_bucket,
    serf_bucket_aggregate_eof_t fn,
    void *baton);

void serf_bucket_aggregate_prepend_iovec(
    serf_bucket_t *aggregate_bucket,
    struct iovec *vecs,
    int vecs_count);

void serf_bucket_aggregate_append_iovec(
    serf_bucket_t *aggregate_bucket,
    struct iovec *vecs,
    int vecs_count);

/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_file;
#define SERF_BUCKET_IS_FILE(b) SERF_BUCKET_CHECK((b), file)

serf_bucket_t *serf_bucket_file_create(
    apr_file_t *file,
    serf_bucket_alloc_t *allocator);


/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_socket;
#define SERF_BUCKET_IS_SOCKET(b) SERF_BUCKET_CHECK((b), socket)

serf_bucket_t *serf_bucket_socket_create(
    apr_socket_t *skt,
    serf_bucket_alloc_t *allocator);

/**
 * Call @a progress_func every time bytes are read from the socket, pass
 * the number of bytes read.
 *
 * When using serf's bytes read & written progress indicator, pass 
 * @a serf_context_progress_delta for progress_func and the serf_context for
 * progress_baton.
 */
void serf_bucket_socket_set_read_progress_cb(
    serf_bucket_t *bucket,
    const serf_progress_t progress_func,
    void *progress_baton);

/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_simple;
#define SERF_BUCKET_IS_SIMPLE(b) SERF_BUCKET_CHECK((b), simple)

typedef void (*serf_simple_freefunc_t)(
    void *baton,
    const char *data);

serf_bucket_t *serf_bucket_simple_create(
    const char *data,
    apr_size_t len,
    serf_simple_freefunc_t freefunc,
    void *freefunc_baton,
    serf_bucket_alloc_t *allocator);

/**
 * Equivalent to serf_bucket_simple_create, except that the bucket takes
 * ownership of a private copy of the data.
 */
serf_bucket_t *serf_bucket_simple_copy_create(
    const char *data,
    apr_size_t len,
    serf_bucket_alloc_t *allocator);

/**
 * Equivalent to serf_bucket_simple_create, except that the bucket assumes
 * responsibility for freeing the data on this allocator without making
 * a copy.  It is assumed that data was created by a call from allocator.
 */
serf_bucket_t *serf_bucket_simple_own_create(
    const char *data,
    apr_size_t len,
    serf_bucket_alloc_t *allocator);

#define SERF_BUCKET_SIMPLE_STRING(s,a) \
    serf_bucket_simple_create(s, strlen(s), NULL, NULL, a);

#define SERF_BUCKET_SIMPLE_STRING_LEN(s,l,a) \
    serf_bucket_simple_create(s, l, NULL, NULL, a);

/* ==================================================================== */


/* Note: apr_mmap_t is always defined, but if APR doesn't have mmaps, then
   the caller can never create an apr_mmap_t to pass to this function. */

extern const serf_bucket_type_t serf_bucket_type_mmap;
#define SERF_BUCKET_IS_MMAP(b) SERF_BUCKET_CHECK((b), mmap)

serf_bucket_t *serf_bucket_mmap_create(
    apr_mmap_t *mmap,
    serf_bucket_alloc_t *allocator);


/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_headers;
#define SERF_BUCKET_IS_HEADERS(b) SERF_BUCKET_CHECK((b), headers)

serf_bucket_t *serf_bucket_headers_create(
    serf_bucket_alloc_t *allocator);

/**
 * Set, default: value copied.
 *
 * Set the specified @a header within the bucket, copying the @a value
 * into space from this bucket's allocator. The header is NOT copied,
 * so it should remain in scope at least as long as the bucket.
 */
void serf_bucket_headers_set(
    serf_bucket_t *headers_bucket,
    const char *header,
    const char *value);

/**
 * Set, copies: header and value copied.
 *
 * Copy the specified @a header and @a value into the bucket, using space
 * from this bucket's allocator.
 */
void serf_bucket_headers_setc(
    serf_bucket_t *headers_bucket,
    const char *header,
    const char *value);

/**
 * Set, no copies.
 *
 * Set the specified @a header and @a value into the bucket, without
 * copying either attribute. Both attributes should remain in scope at
 * least as long as the bucket.
 *
 * @note In the case where a header already exists this will result
 *       in a reallocation and copy, @see serf_bucket_headers_setn.
 */
void serf_bucket_headers_setn(
    serf_bucket_t *headers_bucket,
    const char *header,
    const char *value);

/**
 * Set, extended: fine grained copy control of header and value.
 *
 * Set the specified @a header, with length @a header_size with the
 * @a value, and length @a value_size, into the bucket. The header will
 * be copied if @a header_copy is set, and the value is copied if
 * @a value_copy is set. If the values are not copied, then they should
 * remain in scope at least as long as the bucket.
 *
 * If @a headers_bucket already contains a header with the same name
 * as @a header, then append @a value to the existing value,
 * separating with a comma (as per RFC 2616, section 4.2).  In this
 * case, the new value must be allocated and the header re-used, so
 * behave as if @a value_copy were true and @a header_copy false.
 */
void serf_bucket_headers_setx(
    serf_bucket_t *headers_bucket,
    const char *header,
    apr_size_t header_size,
    int header_copy,
    const char *value,
    apr_size_t value_size,
    int value_copy);

const char *serf_bucket_headers_get(
    serf_bucket_t *headers_bucket,
    const char *header);

/**
 * @param baton opaque baton as passed to @see serf_bucket_headers_do
 * @param key The header key from this iteration through the table
 * @param value The header value from this iteration through the table
 */
typedef int (serf_bucket_headers_do_callback_fn_t)(
    void *baton,
    const char *key,
    const char *value);

/**
 * Iterates over all headers of the message and invokes the callback 
 * function with header key and value. Stop iterating when no more
 * headers are available or when the callback function returned a 
 * non-0 value.
 *
 * @param headers_bucket headers to iterate over
 * @param func callback routine to invoke for every header in the bucket
 * @param baton baton to pass on each invocation to func
 */
void serf_bucket_headers_do(
    serf_bucket_t *headers_bucket,
    serf_bucket_headers_do_callback_fn_t func,
    void *baton);


/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_chunk;
#define SERF_BUCKET_IS_CHUNK(b) SERF_BUCKET_CHECK((b), chunk)

serf_bucket_t *serf_bucket_chunk_create(
    serf_bucket_t *stream,
    serf_bucket_alloc_t *allocator);


/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_dechunk;
#define SERF_BUCKET_IS_DECHUNK(b) SERF_BUCKET_CHECK((b), dechunk)

serf_bucket_t *serf_bucket_dechunk_create(
    serf_bucket_t *stream,
    serf_bucket_alloc_t *allocator);


/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_deflate;
#define SERF_BUCKET_IS_DEFLATE(b) SERF_BUCKET_CHECK((b), deflate)

#define SERF_DEFLATE_GZIP 0
#define SERF_DEFLATE_DEFLATE 1

serf_bucket_t *serf_bucket_deflate_create(
    serf_bucket_t *stream,
    serf_bucket_alloc_t *allocator,
    int format);


/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_limit;
#define SERF_BUCKET_IS_LIMIT(b) SERF_BUCKET_CHECK((b), limit)

serf_bucket_t *serf_bucket_limit_create(
    serf_bucket_t *stream,
    apr_uint64_t limit,
    serf_bucket_alloc_t *allocator);


/* ==================================================================== */
#define SERF_SSL_CERT_NOTYETVALID       1
#define SERF_SSL_CERT_EXPIRED           2
#define SERF_SSL_CERT_UNKNOWNCA         4
#define SERF_SSL_CERT_SELF_SIGNED       8
#define SERF_SSL_CERT_UNKNOWN_FAILURE  16
#define SERF_SSL_CERT_REVOKED          32

extern const serf_bucket_type_t serf_bucket_type_ssl_encrypt;
#define SERF_BUCKET_IS_SSL_ENCRYPT(b) SERF_BUCKET_CHECK((b), ssl_encrypt)

typedef struct serf_ssl_context_t serf_ssl_context_t;
typedef struct serf_ssl_certificate_t serf_ssl_certificate_t;

typedef apr_status_t (*serf_ssl_need_client_cert_t)(
    void *data,
    const char **cert_path);

typedef apr_status_t (*serf_ssl_need_cert_password_t)(
    void *data,
    const char *cert_path,
    const char **password);

typedef apr_status_t (*serf_ssl_need_server_cert_t)(
    void *data, 
    int failures,
    const serf_ssl_certificate_t *cert);

typedef apr_status_t (*serf_ssl_server_cert_chain_cb_t)(
    void *data,
    int failures,
    int error_depth,
    const serf_ssl_certificate_t * const * certs,
    apr_size_t certs_len);

void serf_ssl_client_cert_provider_set(
    serf_ssl_context_t *context,
    serf_ssl_need_client_cert_t callback,
    void *data,
    void *cache_pool);

void serf_ssl_client_cert_password_set(
    serf_ssl_context_t *context,
    serf_ssl_need_cert_password_t callback,
    void *data,
    void *cache_pool);

/**
 * Set a callback to override the default SSL server certificate validation 
 * algorithm.
 */
void serf_ssl_server_cert_callback_set(
    serf_ssl_context_t *context,
    serf_ssl_need_server_cert_t callback,
    void *data);

/**
 * Set callbacks to override the default SSL server certificate validation 
 * algorithm for the current certificate or the entire certificate chain. 
 */
void serf_ssl_server_cert_chain_callback_set(
    serf_ssl_context_t *context,
    serf_ssl_need_server_cert_t cert_callback,
    serf_ssl_server_cert_chain_cb_t cert_chain_callback,
    void *data);

/**
 * Use the default root CA certificates as included with the OpenSSL library.
 */
apr_status_t serf_ssl_use_default_certificates(
    serf_ssl_context_t *context);

/**
 * Allow SNI indicators to be sent to the server.
 */
apr_status_t serf_ssl_set_hostname(
    serf_ssl_context_t *context, const char *hostname);

/**
 * Return the depth of the certificate.
 */
int serf_ssl_cert_depth(
    const serf_ssl_certificate_t *cert);

/**
 * Extract the fields of the issuer in a table with keys (E, CN, OU, O, L, 
 * ST and C). The returned table will be allocated in @a pool.
 */
apr_hash_t *serf_ssl_cert_issuer(
    const serf_ssl_certificate_t *cert,
    apr_pool_t *pool);

/**
 * Extract the fields of the subject in a table with keys (E, CN, OU, O, L, 
 * ST and C). The returned table will be allocated in @a pool.
 */
apr_hash_t *serf_ssl_cert_subject(
    const serf_ssl_certificate_t *cert,
    apr_pool_t *pool);

/**
 * Extract the fields of the certificate in a table with keys (sha1, notBefore,
 * notAfter, subjectAltName). The returned table will be allocated in @a pool.
 */
apr_hash_t *serf_ssl_cert_certificate(
    const serf_ssl_certificate_t *cert,
    apr_pool_t *pool);

/**
 * Export a certificate to base64-encoded, zero-terminated string.
 * The returned string is allocated in @a pool. Returns NULL on failure.
 */
const char *serf_ssl_cert_export(
    const serf_ssl_certificate_t *cert,
    apr_pool_t *pool);

/**
 * Load a CA certificate file from a path @a file_path. If the file was loaded
 * and parsed correctly, a certificate @a cert will be created and returned.
 * This certificate object will be alloced in @a pool.
 */
apr_status_t serf_ssl_load_cert_file(
    serf_ssl_certificate_t **cert,
    const char *file_path,
    apr_pool_t *pool);

/**
 * Adds the certificate @a cert to the list of trusted certificates in 
 * @a ssl_ctx that will be used for verification. 
 * See also @a serf_ssl_load_cert_file.
 */
apr_status_t serf_ssl_trust_cert(
    serf_ssl_context_t *ssl_ctx,
    serf_ssl_certificate_t *cert);

/**
 * Enable or disable SSL compression on a SSL session.
 * @a enabled = 1 to enable compression, 0 to disable compression.
 * Default = disabled.
 */
apr_status_t serf_ssl_use_compression(
    serf_ssl_context_t *ssl_ctx,
    int enabled);

serf_bucket_t *serf_bucket_ssl_encrypt_create(
    serf_bucket_t *stream,
    serf_ssl_context_t *ssl_context,
    serf_bucket_alloc_t *allocator);

serf_ssl_context_t *serf_bucket_ssl_encrypt_context_get(
    serf_bucket_t *bucket);

/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_ssl_decrypt;
#define SERF_BUCKET_IS_SSL_DECRYPT(b) SERF_BUCKET_CHECK((b), ssl_decrypt)

serf_bucket_t *serf_bucket_ssl_decrypt_create(
    serf_bucket_t *stream,
    serf_ssl_context_t *ssl_context,
    serf_bucket_alloc_t *allocator);

serf_ssl_context_t *serf_bucket_ssl_decrypt_context_get(
    serf_bucket_t *bucket);


/* ==================================================================== */


extern const serf_bucket_type_t serf_bucket_type_barrier;
#define SERF_BUCKET_IS_BARRIER(b) SERF_BUCKET_CHECK((b), barrier)

serf_bucket_t *serf_bucket_barrier_create(
    serf_bucket_t *stream,
    serf_bucket_alloc_t *allocator);


/* ==================================================================== */

extern const serf_bucket_type_t serf_bucket_type_iovec;
#define SERF_BUCKET_IS_IOVEC(b) SERF_BUCKET_CHECK((b), iovec)

serf_bucket_t *serf_bucket_iovec_create(
    struct iovec vecs[],
    int len,
    serf_bucket_alloc_t *allocator);


/* ==================================================================== */

/* ### do we need a PIPE bucket type? they are simple apr_file_t objects */


#ifdef __cplusplus
}
#endif

#endif	/* !SERF_BUCKET_TYPES_H */