1 files changed, 144 insertions, 0 deletions
diff --git a/web/server/h2o/libh2o/lib/handler/compress.c b/web/server/h2o/libh2o/lib/handler/compress.c
new file mode 100644
index 00000000..61597713
--- /dev/null
+++ b/web/server/h2o/libh2o/lib/handler/compress.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2015,2016 Justin Zhu, DeNA Co., Ltd., Kazuho Oku
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+#include <assert.h>
+#include <stdlib.h>
+#include "h2o.h"
+
+#ifndef BUF_SIZE
+#define BUF_SIZE 8192
+#endif
+
+struct st_compress_filter_t {
+    h2o_filter_t super;
+    h2o_compress_args_t args;
+};
+
+struct st_compress_encoder_t {
+    h2o_ostream_t super;
+    h2o_compress_context_t *compressor;
+};
+
+static void do_send(h2o_ostream_t *_self, h2o_req_t *req, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_send_state_t state)
+{
+    struct st_compress_encoder_t *self = (void *)_self;
+    h2o_iovec_t *outbufs;
+    size_t outbufcnt;
+
+    self->compressor->transform(self->compressor, inbufs, inbufcnt, state, &outbufs, &outbufcnt);
+    h2o_ostream_send_next(&self->super, req, outbufs, outbufcnt, state);
+}
+
+static void on_setup_ostream(h2o_filter_t *_self, h2o_req_t *req, h2o_ostream_t **slot)
+{
+    struct st_compress_filter_t *self = (void *)_self;
+    struct st_compress_encoder_t *encoder;
+    int compressible_types;
+    h2o_compress_context_t *compressor;
+    ssize_t i;
+
+    if (req->version < 0x101)
+        goto Next;
+    if (req->res.status != 200)
+        goto Next;
+    if (h2o_memis(req->input.method.base, req->input.method.len, H2O_STRLIT("HEAD")))
+        goto Next;
+
+    switch (req->compress_hint) {
+    case H2O_COMPRESS_HINT_DISABLE:
+        /* compression was explicitely disabled, skip */
+        goto Next;
+    case H2O_COMPRESS_HINT_ENABLE:
+        /* compression was explicitely enabled */
+        break;
+    case H2O_COMPRESS_HINT_AUTO:
+    default:
+        /* no hint from the producer, decide whether to compress based
+           on the configuration */
+        if (req->res.mime_attr == NULL)
+            h2o_req_fill_mime_attributes(req);
+        if (!req->res.mime_attr->is_compressible)
+            goto Next;
+        if (req->res.content_length < self->args.min_size)
+            goto Next;
+    }
+
+    /* skip if failed to gather the list of compressible types */
+    if ((compressible_types = h2o_get_compressible_types(&req->headers)) == 0)
+        goto Next;
+
+    /* skip if content-encoding header is being set (as well as obtain the location of accept-ranges) */
+    size_t content_encoding_header_index = -1, accept_ranges_header_index = -1;
+    for (i = 0; i != req->res.headers.size; ++i) {
+        if (req->res.headers.entries[i].name == &H2O_TOKEN_CONTENT_ENCODING->buf)
+            content_encoding_header_index = i;
+        else if (req->res.headers.entries[i].name == &H2O_TOKEN_ACCEPT_RANGES->buf)
+            accept_ranges_header_index = i;
+        else
+            continue;
+    }
+    if (content_encoding_header_index != -1)
+        goto Next;
+
+/* open the compressor */
+#if H2O_USE_BROTLI
+    if (self->args.brotli.quality != -1 && (compressible_types & H2O_COMPRESSIBLE_BROTLI) != 0) {
+        compressor = h2o_compress_brotli_open(&req->pool, self->args.brotli.quality, req->res.content_length);
+    } else
+#endif
+        if (self->args.gzip.quality != -1 && (compressible_types & H2O_COMPRESSIBLE_GZIP) != 0) {
+        compressor = h2o_compress_gzip_open(&req->pool, self->args.gzip.quality);
+    } else {
+        /* let proxies know that we looked at accept-encoding when deciding not to compress */
+        h2o_set_header_token(&req->pool, &req->res.headers, H2O_TOKEN_VARY, H2O_STRLIT("accept-encoding"));
+        goto Next;
+    }
+
+    /* adjust the response headers */
+    req->res.content_length = SIZE_MAX;
+    h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_CONTENT_ENCODING, NULL, compressor->name.base, compressor->name.len);
+    h2o_set_header_token(&req->pool, &req->res.headers, H2O_TOKEN_VARY, H2O_STRLIT("accept-encoding"));
+    if (accept_ranges_header_index != -1) {
+        req->res.headers.entries[accept_ranges_header_index].value = h2o_iovec_init(H2O_STRLIT("none"));
+    } else {
+        h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_ACCEPT_RANGES, NULL, H2O_STRLIT("none"));
+    }
+
+    /* setup filter */
+    encoder = (void *)h2o_add_ostream(req, sizeof(*encoder), slot);
+    encoder->super.do_send = do_send;
+    slot = &encoder->super.next;
+    encoder->compressor = compressor;
+
+    /* adjust preferred chunk size (compress by 8192 bytes) */
+    if (req->preferred_chunk_size > BUF_SIZE)
+        req->preferred_chunk_size = BUF_SIZE;
+
+Next:
+    h2o_setup_next_ostream(req, slot);
+}
+
+void h2o_compress_register(h2o_pathconf_t *pathconf, h2o_compress_args_t *args)
+{
+    struct st_compress_filter_t *self = (void *)h2o_create_filter(pathconf, sizeof(*self));
+    self->super.on_setup_ostream = on_setup_ostream;
+    self->args = *args;
+}