Add unauthenticated HTTP REST interface to public blockchain data.

4 files changed, 216 insertions, 1 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 8b5d009842..2c2a96b198 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -165,6 +165,7 @@ libbitcoin_server_a_SOURCES = \
   net.cpp \
   noui.cpp \
   pow.cpp \
+  rest.cpp \
   rpcblockchain.cpp \
   rpcmining.cpp \
   rpcmisc.cpp \
diff --git a/src/rest.cpp b/src/rest.cpp
new file mode 100644
index 0000000000..48c1672ae8
--- /dev/null
+++ b/src/rest.cpp
@@ -0,0 +1,201 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2012 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <boost/algorithm/string.hpp>
+#include "rpcserver.h"
+#include "streams.h"
+#include "utilstrencodings.h"
+#include "core/block.h"
+#include "core/transaction.h"
+#include "version.h"
+#include "main.h"
+
+using namespace std;
+using namespace json_spirit;
+
+enum RetFormat {
+    RF_BINARY,
+    RF_HEX,
+    RF_JSON,
+};
+
+static const struct {
+    enum RetFormat rf;
+    const char *name;
+} rf_names[] = {
+    { RF_BINARY, "binary" },            // default, if match not found
+    { RF_HEX, "hex" },
+    { RF_JSON, "json" },
+};
+
+class RestErr {
+public:
+    enum HTTPStatusCode status;
+    string message;
+};
+
+extern void TxToJSON(const CTransaction& tx, const uint256 hashBlock, Object& entry);
+extern Object blockToJSON(const CBlock& block, const CBlockIndex* blockindex);
+
+static RestErr RESTERR(enum HTTPStatusCode status, string message)
+{
+    RestErr re;
+    re.status = status;
+    re.message = message;
+    return re;
+}
+
+static enum RetFormat ParseDataFormat(const string& format)
+{
+    for (unsigned int i = 0; i < ARRAYLEN(rf_names); i++)
+        if (format == rf_names[i].name)
+            return rf_names[i].rf;
+
+    return rf_names[0].rf;
+}
+
+static bool ParseHashStr(string& strReq, uint256& v)
+{
+    if (!IsHex(strReq) || (strReq.size() != 64))
+        return false;
+
+    v.SetHex(strReq);
+    return true;
+}
+
+static bool rest_block(AcceptedConnection *conn,
+                       string& strReq,
+                       map<string, string>& mapHeaders,
+                       bool fRun)
+{
+    vector<string> params;
+    boost::split(params, strReq, boost::is_any_of("/"));
+
+    enum RetFormat rf = ParseDataFormat(params.size() > 1 ? params[1] : string(""));
+
+    string hashStr = params[0];
+    uint256 hash;
+    if (!ParseHashStr(hashStr, hash))
+        throw RESTERR(HTTP_BAD_REQUEST, "Invalid hash: " + hashStr);
+
+    if (mapBlockIndex.count(hash) == 0)
+        throw RESTERR(HTTP_NOT_FOUND, hashStr + " not found");
+
+    CBlock block;
+    CBlockIndex* pblockindex = mapBlockIndex[hash];
+    if (!ReadBlockFromDisk(block, pblockindex))
+        throw RESTERR(HTTP_NOT_FOUND, hashStr + " not found");
+
+    CDataStream ssBlock(SER_NETWORK, PROTOCOL_VERSION);
+    ssBlock << block;
+
+    switch (rf) {
+    case RF_BINARY: {
+        string binaryBlock = ssBlock.str();
+        conn->stream() << HTTPReply(HTTP_OK, binaryBlock, fRun, true, "application/octet-stream") << binaryBlock << std::flush;
+        return true;
+    }
+
+    case RF_HEX: {
+        string strHex = HexStr(ssBlock.begin(), ssBlock.end()) + "\n";;
+        conn->stream() << HTTPReply(HTTP_OK, strHex, fRun, false, "text/plain") << std::flush;
+        return true;
+    }
+
+    case RF_JSON: {
+        Object objBlock = blockToJSON(block, pblockindex);
+        string strJSON = write_string(Value(objBlock), false) + "\n";
+        conn->stream() << HTTPReply(HTTP_OK, strJSON, fRun) << std::flush;
+        return true;
+     }
+    }
+
+    // not reached
+    return true;     // continue to process further HTTP reqs on this cxn
+}
+
+static bool rest_tx(AcceptedConnection *conn,
+                    string& strReq,
+                    map<string, string>& mapHeaders,
+                    bool fRun)
+{
+    vector<string> params;
+    boost::split(params, strReq, boost::is_any_of("/"));
+
+    enum RetFormat rf = ParseDataFormat(params.size() > 1 ? params[1] : string(""));
+
+    string hashStr = params[0];
+    uint256 hash;
+    if (!ParseHashStr(hashStr, hash))
+        throw RESTERR(HTTP_BAD_REQUEST, "Invalid hash: " + hashStr);
+
+    CTransaction tx;
+    uint256 hashBlock = 0;
+    if (!GetTransaction(hash, tx, hashBlock, true))
+        throw RESTERR(HTTP_NOT_FOUND, hashStr + " not found");
+
+    CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+    ssTx << tx;
+
+    switch (rf) {
+    case RF_BINARY: {
+        string binaryTx = ssTx.str();
+        conn->stream() << HTTPReply(HTTP_OK, binaryTx, fRun, true, "application/octet-stream") << binaryTx << std::flush;
+        return true;
+    }
+
+    case RF_HEX: {
+        string strHex = HexStr(ssTx.begin(), ssTx.end()) + "\n";;
+        conn->stream() << HTTPReply(HTTP_OK, strHex, fRun, false, "text/plain") << std::flush;
+        return true;
+    }
+
+    case RF_JSON: {
+        Object objTx;
+        TxToJSON(tx, hashBlock, objTx);
+        string strJSON = write_string(Value(objTx), false) + "\n";
+        conn->stream() << HTTPReply(HTTP_OK, strJSON, fRun) << std::flush;
+        return true;
+     }
+    }
+
+    // not reached
+    return true;     // continue to process further HTTP reqs on this cxn
+}
+
+static const struct {
+    const char *prefix;
+    bool (*handler)(AcceptedConnection *conn,
+                    string& strURI,
+                    map<string, string>& mapHeaders,
+                    bool fRun);
+} uri_prefixes[] = {
+    { "/rest/tx/", rest_tx },
+    { "/rest/block/", rest_block },
+};
+
+bool HTTPReq_REST(AcceptedConnection *conn,
+                  string& strURI,
+                  map<string, string>& mapHeaders,
+                  bool fRun)
+{
+    try {
+        for (unsigned int i = 0; i < ARRAYLEN(uri_prefixes); i++) {
+            unsigned int plen = strlen(uri_prefixes[i].prefix);
+            if (strURI.substr(0, plen) == uri_prefixes[i].prefix) {
+                string strReq = strURI.substr(plen);
+                return uri_prefixes[i].handler(conn, strReq, mapHeaders, fRun);
+            }
+        }
+    }
+    catch (RestErr& re) {
+        conn->stream() << HTTPReply(re.status, re.message + "\r\n", false, false, "text/plain") << std::flush;
+        return false;
+    }
+
+    conn->stream() << HTTPReply(HTTP_NOT_FOUND, "", false) << std::flush;
+    return false;
+}
+
diff --git a/src/rpcserver.cpp b/src/rpcserver.cpp
index cc80887ba4..d072f18e36 100644
--- a/src/rpcserver.cpp
+++ b/src/rpcserver.cpp
@@ -946,11 +946,18 @@ void ServiceConnection(AcceptedConnection *conn)
         if (mapHeaders["connection"] == "close")
             fRun = false;
 
+        // Process via JSON-RPC API
         if (strURI == "/") {
             if (!HTTPReq_JSONRPC(conn, strRequest, mapHeaders, fRun))
                 break;
+
+        // Process via HTTP REST API
+        } else if (strURI.substr(0, 6) == "/rest/") {
+            if (!HTTPReq_REST(conn, strURI, mapHeaders, fRun))
+                break;
+
         } else {
-            conn->stream() << HTTPError(HTTP_NOT_FOUND, false) << std::flush;
+            conn->stream() << HTTPReply(HTTP_NOT_FOUND, "", false) << std::flush;
             break;
         }
     }
diff --git a/src/rpcserver.h b/src/rpcserver.h
index 2a258dd89a..60793f79ae 100644
--- a/src/rpcserver.h
+++ b/src/rpcserver.h
@@ -218,4 +218,10 @@ extern json_spirit::Value gettxout(const json_spirit::Array& params, bool fHelp)
 extern json_spirit::Value verifychain(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value getchaintips(const json_spirit::Array& params, bool fHelp);
 
+// in rest.cpp
+extern bool HTTPReq_REST(AcceptedConnection *conn,
+                  std::string& strURI,
+                  std::map<std::string, std::string>& mapHeaders,
+                  bool fRun);
+
 #endif // BITCOIN_RPCSERVER_H