minimal-http-client-post
This commit is contained in:
Andy Green
parent
a017c4b0eb
commit
719f735309
5 changed files with 488 additions and 0 deletions
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@ -2,4 +2,5 @@
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---|---
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minimal-http-client-hugeurl|Sends a > 2.5KB URL to warmcat.com
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minimal-http-client-multi|Connects to and reads https://warmcat.com, 8 times concurrently
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minimal-http-client-post|POSTs a form containing an uploaded file and a form variable, and captures the response
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minimal-http-client|Connects to and reads https://warmcat.com
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cmake_minimum_required(VERSION 2.8)
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include(CheckCSourceCompiles)
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set(SAMP lws-minimal-http-client-post)
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set(SRCS minimal-http-client-post.c)
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# If we are being built as part of lws, confirm current build config supports
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# reqconfig, else skip building ourselves.
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#
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# If we are being built externally, confirm installed lws was configured to
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# support reqconfig, else error out with a helpful message about the problem.
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#
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MACRO(require_lws_config reqconfig _val result)
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if (DEFINED ${reqconfig})
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if (${reqconfig})
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set (rq 1)
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else()
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set (rq 0)
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endif()
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else()
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set(rq 0)
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endif()
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if (${_val} EQUAL ${rq})
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set(SAME 1)
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else()
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set(SAME 0)
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endif()
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if (LWS_WITH_MINIMAL_EXAMPLES AND NOT ${SAME})
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if (${_val})
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message("${SAMP}: skipping as lws being built without ${reqconfig}")
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else()
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message("${SAMP}: skipping as lws built with ${reqconfig}")
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endif()
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set(${result} 0)
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else()
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if (LWS_WITH_MINIMAL_EXAMPLES)
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set(MET ${SAME})
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else()
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CHECK_C_SOURCE_COMPILES("#include <libwebsockets.h>\nint main(void) {\n#if defined(${reqconfig})\n return 0;\n#else\n fail;\n#endif\n return 0;\n}\n" HAS_${reqconfig})
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if (NOT DEFINED HAS_${reqconfig} OR NOT HAS_${reqconfig})
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set(HAS_${reqconfig} 0)
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else()
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set(HAS_${reqconfig} 1)
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endif()
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if ((HAS_${reqconfig} AND ${_val}) OR (NOT HAS_${reqconfig} AND NOT ${_val}))
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set(MET 1)
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else()
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set(MET 0)
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endif()
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endif()
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if (NOT MET)
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if (${_val})
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message(FATAL_ERROR "This project requires lws must have been configured with ${reqconfig}")
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else()
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message(FATAL_ERROR "Lws configuration of ${reqconfig} is incompatible with this project")
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endif()
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endif()
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endif()
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ENDMACRO()
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set(requirements 1)
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require_lws_config(LWS_WITHOUT_CLIENT 0 requirements)
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if (requirements)
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add_executable(${SAMP} ${SRCS})
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if (websockets_shared)
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target_link_libraries(${SAMP} websockets_shared)
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add_dependencies(${SAMP} websockets_shared)
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else()
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target_link_libraries(${SAMP} websockets)
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endif()
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endif()
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# lws minimal http client POST
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This example demonstrates a multipart POST to
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https://libwebsockets.org/testserver/formtest
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setting both a form variable and uploading a
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short file.
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The result of the POST form processing is captured
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and displayed in a hexdump.
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This is programmatically POSTing to the same
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form you can access at
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https://libwebsockets.org/testserver
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in the "POST" tab with file upload.
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By default the client action occurs using http/2 if
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your lws was built with `-DLWS_WITH_HTTP2=1`.
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## build
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```
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$ cmake . && make
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```
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## usage
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```
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$ ./lws-minimal-http-client-post
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[2018/04/03 13:13:10:7891] USER: LWS minimal http client - POST
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[2018/04/03 13:13:10:7905] NOTICE: Creating Vhost 'default' (serving disabled), 1 protocols, IPv6 on
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[2018/04/03 13:13:10:7984] NOTICE: created client ssl context for default
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[2018/04/03 13:13:12:8444] USER: LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER
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[2018/04/03 13:13:12:8444] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE
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[2018/04/03 13:13:12:8445] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE
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[2018/04/03 13:13:12:8445] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE
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[2018/04/03 13:13:13:1437] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE
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[2018/04/03 13:13:13:1440] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE
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[2018/04/03 13:13:13:1440] USER: RECEIVE_CLIENT_HTTP_READ: read 402
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[2018/04/03 13:13:13:1441] NOTICE:
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[2018/04/03 13:13:13:1441] NOTICE: 0000: 3C 68 74 6D 6C 3E 3C 62 6F 64 79 3E 3C 68 31 3E <html><body><h1>
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[2018/04/03 13:13:13:1441] NOTICE: 0010: 46 6F 72 6D 20 72 65 73 75 6C 74 73 20 28 61 66 Form results (af
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[2018/04/03 13:13:13:1441] NOTICE: 0020: 74 65 72 20 75 72 6C 64 65 63 6F 64 69 6E 67 29 ter urldecoding)
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[2018/04/03 13:13:13:1441] NOTICE: 0030: 3C 2F 68 31 3E 3C 74 61 62 6C 65 3E 3C 74 72 3E </h1><table><tr>
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[2018/04/03 13:13:13:1441] NOTICE: 0040: 3C 74 64 3E 4E 61 6D 65 3C 2F 74 64 3E 3C 74 64 <td>Name</td><td
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[2018/04/03 13:13:13:1441] NOTICE: 0050: 3E 4C 65 6E 67 74 68 3C 2F 74 64 3E 3C 74 64 3E >Length</td><td>
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[2018/04/03 13:13:13:1441] NOTICE: 0060: 56 61 6C 75 65 3C 2F 74 64 3E 3C 2F 74 72 3E 3C Value</td></tr><
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[2018/04/03 13:13:13:1441] NOTICE: 0070: 74 72 3E 3C 74 64 3E 3C 62 3E 74 65 78 74 3C 2F tr><td><b>text</
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[2018/04/03 13:13:13:1441] NOTICE: 0080: 62 3E 3C 2F 74 64 3E 3C 74 64 3E 31 33 3C 2F 74 b></td><td>13</t
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[2018/04/03 13:13:13:1441] NOTICE: 0090: 64 3E 3C 74 64 3E 6D 79 20 74 65 78 74 20 66 69 d><td>my text fi
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[2018/04/03 13:13:13:1441] NOTICE: 00A0: 65 6C 64 3C 2F 74 64 3E 3C 2F 74 72 3E 3C 74 72 eld</td></tr><tr
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[2018/04/03 13:13:13:1441] NOTICE: 00B0: 3E 3C 74 64 3E 3C 62 3E 73 65 6E 64 3C 2F 62 3E ><td><b>send</b>
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[2018/04/03 13:13:13:1441] NOTICE: 00C0: 3C 2F 74 64 3E 3C 74 64 3E 30 3C 2F 74 64 3E 3C </td><td>0</td><
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[2018/04/03 13:13:13:1442] NOTICE: 00D0: 74 64 3E 4E 55 4C 4C 3C 2F 74 64 3E 3C 2F 74 72 td>NULL</td></tr
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[2018/04/03 13:13:13:1442] NOTICE: 00E0: 3E 3C 74 72 3E 3C 74 64 3E 3C 62 3E 66 69 6C 65 ><tr><td><b>file
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[2018/04/03 13:13:13:1442] NOTICE: 00F0: 3C 2F 62 3E 3C 2F 74 64 3E 3C 74 64 3E 30 3C 2F </b></td><td>0</
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[2018/04/03 13:13:13:1442] NOTICE: 0100: 74 64 3E 3C 74 64 3E 4E 55 4C 4C 3C 2F 74 64 3E td><td>NULL</td>
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[2018/04/03 13:13:13:1442] NOTICE: 0110: 3C 2F 74 72 3E 3C 74 72 3E 3C 74 64 3E 3C 62 3E </tr><tr><td><b>
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[2018/04/03 13:13:13:1442] NOTICE: 0120: 75 70 6C 6F 61 64 3C 2F 62 3E 3C 2F 74 64 3E 3C upload</b></td><
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[2018/04/03 13:13:13:1442] NOTICE: 0130: 74 64 3E 30 3C 2F 74 64 3E 3C 74 64 3E 4E 55 4C td>0</td><td>NUL
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[2018/04/03 13:13:13:1442] NOTICE: 0140: 4C 3C 2F 74 64 3E 3C 2F 74 72 3E 3C 2F 74 61 62 L</td></tr></tab
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[2018/04/03 13:13:13:1442] NOTICE: 0150: 6C 65 3E 3C 62 72 3E 3C 62 3E 66 69 6C 65 6E 61 le><br><b>filena
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[2018/04/03 13:13:13:1442] NOTICE: 0160: 6D 65 3A 3C 2F 62 3E 20 6D 79 66 69 6C 65 2E 74 me:</b> myfile.t
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[2018/04/03 13:13:13:1442] NOTICE: 0170: 78 74 2C 20 3C 62 3E 6C 65 6E 67 74 68 3C 2F 62 xt, <b>length</b
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[2018/04/03 13:13:13:1442] NOTICE: 0180: 3E 20 34 34 3C 2F 62 6F 64 79 3E 3C 2F 68 74 6D > 44</body></htm
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[2018/04/03 13:13:13:1442] NOTICE: 0190: 6C 3E l>
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[2018/04/03 13:13:13:1442] NOTICE:
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[2018/04/03 13:13:13:1442] USER: LWS_CALLBACK_COMPLETED_CLIENT_HTTP
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[2018/04/03 13:13:13:1455] USER: Completed
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```
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@ -0,0 +1,92 @@
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|
||||
a0Tkx63ubUFfclpxCDezeWWkWaCUN/cALw3CknLa0Dhy2xSoRcRdKn23tNbE7qzN
|
||||
E0S3ySvdQwAl+mG5aWpYIxG3pzOPVnVZ9c0p10a3CitlttNCbxWyuHv77+ldU9U0
|
||||
WicCAwEAAaOB3DCB2TAdBgNVHQ4EFgQUrb2YejS0Jvf6xCZU7wO94CTLVBowCwYD
|
||||
VR0PBAQDAgEGMA8GA1UdEwEB/wQFMAMBAf8wgZkGA1UdIwSBkTCBjoAUrb2YejS0
|
||||
Jvf6xCZU7wO94CTLVBqhc6RxMG8xCzAJBgNVBAYTAlNFMRQwEgYDVQQKEwtBZGRU
|
||||
cnVzdCBBQjEmMCQGA1UECxMdQWRkVHJ1c3QgRXh0ZXJuYWwgVFRQIE5ldHdvcmsx
|
||||
IjAgBgNVBAMTGUFkZFRydXN0IEV4dGVybmFsIENBIFJvb3SCAQEwDQYJKoZIhvcN
|
||||
AQEFBQADggEBALCb4IUlwtYj4g+WBpKdQZic2YR5gdkeWxQHIzZlj7DYd7usQWxH
|
||||
YINRsPkyPef89iYTx4AWpb9a/IfPeHmJIZriTAcKhjW88t5RxNKWt9x+Tu5w/Rw5
|
||||
6wwCURQtjr0W4MHfRnXnJK3s9EK0hZNwEGe6nQY1ShjTK3rMUUKhemPR5ruhxSvC
|
||||
Nr4TDea9Y355e6cJDUCrat2PisP29owaQgVR1EX1n6diIWgVIEM8med8vSTYqZEX
|
||||
c4g/VhsxOBi0cQ+azcgOno4uG+GMmIPLHzHxREzGBHNJdmAPx/i9F4BrLunMTA5a
|
||||
mnkPIAou1Z5jJh5VkpTYghdae9C8x49OhgQ=
|
||||
-----END CERTIFICATE-----
|
||||
|
|
@ -0,0 +1,244 @@
|
|||
/*
|
||||
* lws-minimal-http-client-post
|
||||
*
|
||||
* Copyright (C) 2018 Andy Green <andy@warmcat.com>
|
||||
*
|
||||
* This file is made available under the Creative Commons CC0 1.0
|
||||
* Universal Public Domain Dedication.
|
||||
*
|
||||
* This demonstrates the a minimal http client using lws and POST.
|
||||
*
|
||||
* It POSTs both form data and a file to the form at
|
||||
* https://libwebsockets.org/testserver/formtest and dumps
|
||||
* the html page received generated by the POST handler.
|
||||
*/
|
||||
|
||||
#include <libwebsockets.h>
|
||||
#include <string.h>
|
||||
#include <signal.h>
|
||||
|
||||
static int interrupted;
|
||||
static struct lws *client_wsi;
|
||||
|
||||
struct pss {
|
||||
char boundary[32];
|
||||
char body_part;
|
||||
};
|
||||
|
||||
static int
|
||||
callback_http(struct lws *wsi, enum lws_callback_reasons reason,
|
||||
void *user, void *in, size_t len)
|
||||
{
|
||||
struct pss *pss = (struct pss *)user;
|
||||
char buf[LWS_PRE + 1024], *start = &buf[LWS_PRE], *p = start,
|
||||
*end = &buf[sizeof(buf) - 1];
|
||||
uint8_t **up, *uend;
|
||||
uint32_t r;
|
||||
int n;
|
||||
|
||||
switch (reason) {
|
||||
|
||||
/* because we are protocols[0] ... */
|
||||
case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
|
||||
lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
|
||||
in ? (char *)in : "(null)");
|
||||
client_wsi = NULL;
|
||||
break;
|
||||
|
||||
/* ...callbacks related to receiving the result... */
|
||||
|
||||
case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP:
|
||||
lwsl_user("LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP: response %d\n",
|
||||
lws_http_client_http_response(wsi));
|
||||
break;
|
||||
|
||||
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
|
||||
lwsl_user("RECEIVE_CLIENT_HTTP_READ: read %d\n", (int)len);
|
||||
lwsl_hexdump_notice(in, len);
|
||||
return 0; /* don't passthru */
|
||||
|
||||
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
|
||||
n = sizeof(buf) - LWS_PRE;
|
||||
if (lws_http_client_read(wsi, &p, &n) < 0)
|
||||
return -1;
|
||||
|
||||
return 0; /* don't passthru */
|
||||
|
||||
case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
|
||||
lwsl_user("LWS_CALLBACK_COMPLETED_CLIENT_HTTP\n");
|
||||
client_wsi = NULL;
|
||||
break;
|
||||
|
||||
/* ...callbacks related to generating the POST... */
|
||||
|
||||
case LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER:
|
||||
lwsl_user("LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER\n");
|
||||
up = (uint8_t **)in;
|
||||
uend = *up + len - 1;
|
||||
|
||||
/* generate a random boundary string */
|
||||
|
||||
lws_get_random(lws_get_context(wsi), &r, sizeof(r));
|
||||
lws_snprintf(pss->boundary, sizeof(pss->boundary) - 1,
|
||||
"---boundary-%08x", r);
|
||||
|
||||
n = lws_snprintf(buf, sizeof(buf) - 1,
|
||||
"multipart/form-data; boundary=%s", pss->boundary);
|
||||
if (lws_add_http_header_by_token(wsi,
|
||||
WSI_TOKEN_HTTP_CONTENT_TYPE,
|
||||
(uint8_t *)buf, n, up, uend))
|
||||
return 1;
|
||||
/*
|
||||
* Notice because we are sending multipart/form-data we can
|
||||
* usually rely on the server to understand where the form
|
||||
* payload ends without having to give it an overall
|
||||
* content-length (which can be troublesome to compute ahead
|
||||
* of generating the data to send).
|
||||
*
|
||||
* Tell lws we are going to send the body next...
|
||||
*/
|
||||
lws_client_http_body_pending(wsi, 1);
|
||||
lws_callback_on_writable(wsi);
|
||||
break;
|
||||
|
||||
case LWS_CALLBACK_CLIENT_HTTP_WRITEABLE:
|
||||
lwsl_user("LWS_CALLBACK_CLIENT_HTTP_WRITEABLE\n");
|
||||
n = LWS_WRITE_HTTP;
|
||||
|
||||
/*
|
||||
* For a small body like this, we could prepare it in memory and
|
||||
* send it all at once. But to show how to handle, eg,
|
||||
* arbitrary-sized file payloads, or huge form-data fields, the
|
||||
* sending is done in multiple passes through the event loop.
|
||||
*/
|
||||
|
||||
switch (pss->body_part++) {
|
||||
case 0:
|
||||
/* notice every usage of the boundary starts with -- */
|
||||
p += lws_snprintf(p, end - p, "--%s\xd\xa"
|
||||
"content-disposition: "
|
||||
"form-data; name=\"text\"\xd\xa"
|
||||
"\xd\xa"
|
||||
"my text field"
|
||||
"\xd\xa", pss->boundary);
|
||||
break;
|
||||
case 1:
|
||||
p += lws_snprintf(p, end - p,
|
||||
"--%s\xd\xa"
|
||||
"content-disposition: form-data; name=\"file\";"
|
||||
"filename=\"myfile.txt\"\xd\xa"
|
||||
"content-type: text/plain\xd\xa"
|
||||
"\xd\xa"
|
||||
"This is the contents of the "
|
||||
"uploaded file.\xd\xa"
|
||||
"\xd\xa", pss->boundary);
|
||||
break;
|
||||
case 2:
|
||||
p += lws_snprintf(p, end - p, "--%s--\xd\xa",
|
||||
pss->boundary);
|
||||
lws_client_http_body_pending(wsi, 0);
|
||||
/* necessary to support H2, it means we will write no
|
||||
* more on this stream */
|
||||
n = LWS_WRITE_HTTP_FINAL;
|
||||
break;
|
||||
|
||||
default:
|
||||
/*
|
||||
* We can get extra callbacks here, if nothing to do,
|
||||
* then do nothing.
|
||||
*/
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (lws_write(wsi, (uint8_t *)start, lws_ptr_diff(p, start), n)
|
||||
!= lws_ptr_diff(p, start))
|
||||
return 1;
|
||||
|
||||
if (n != LWS_WRITE_HTTP_FINAL)
|
||||
lws_callback_on_writable(wsi);
|
||||
|
||||
return 0;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return lws_callback_http_dummy(wsi, reason, user, in, len);
|
||||
}
|
||||
|
||||
static const struct lws_protocols protocols[] = {
|
||||
{
|
||||
"http",
|
||||
callback_http,
|
||||
sizeof(struct pss),
|
||||
0,
|
||||
},
|
||||
{ NULL, NULL, 0, 0 }
|
||||
};
|
||||
|
||||
static void
|
||||
sigint_handler(int sig)
|
||||
{
|
||||
interrupted = 1;
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
struct lws_context_creation_info info;
|
||||
struct lws_client_connect_info i;
|
||||
struct lws_context *context;
|
||||
int n = 0;
|
||||
|
||||
signal(SIGINT, sigint_handler);
|
||||
lws_set_log_level(LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
|
||||
/* for LLL_ verbosity above NOTICE to be built into lws,
|
||||
* lws must have been configured and built with
|
||||
* -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE */
|
||||
/* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */
|
||||
/* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */
|
||||
/* | LLL_DEBUG */, NULL);
|
||||
|
||||
lwsl_user("LWS minimal http client - POST\n");
|
||||
|
||||
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
|
||||
info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
|
||||
info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */
|
||||
info.protocols = protocols;
|
||||
|
||||
#if defined(LWS_WITH_MBEDTLS)
|
||||
/*
|
||||
* OpenSSL uses the system trust store. mbedTLS has to be told which
|
||||
* CA to trust explicitly.
|
||||
*/
|
||||
info.client_ssl_ca_filepath = "./libwebsockets.org.cer";
|
||||
#endif
|
||||
|
||||
context = lws_create_context(&info);
|
||||
if (!context) {
|
||||
lwsl_err("lws init failed\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
memset(&i, 0, sizeof i); /* otherwise uninitialized garbage */
|
||||
i.context = context;
|
||||
|
||||
i.port = 443;
|
||||
i.address = "libwebsockets.org";
|
||||
i.path = "/testserver/formtest";
|
||||
i.ssl_connection = /* LCCSCF_NOT_H2 | */ LCCSCF_USE_SSL;
|
||||
i.host = i.address;
|
||||
i.origin = i.address;
|
||||
i.method = "POST";
|
||||
|
||||
i.protocol = protocols[0].name;
|
||||
i.pwsi = &client_wsi;
|
||||
lws_client_connect_via_info(&i);
|
||||
|
||||
while (n >= 0 && client_wsi && !interrupted)
|
||||
n = lws_service(context, 1000);
|
||||
|
||||
lws_context_destroy(context);
|
||||
lwsl_user("Completed\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue