mirror of
https://github.com/mikecarper/MeshCore.git
synced 2026-09-26 16:27:57 +00:00
152 lines
6.2 KiB
Python
152 lines
6.2 KiB
Python
#!/usr/bin/env python
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#
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# Pre-build script: Brotli-compress webui/index.html into a PROGMEM C header so the
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# webconfig portal can serve the page straight from flash with
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# Content-Encoding: br. The generated header is tracked so ESP32 targets
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# that replace extra_scripts still compile from a clean checkout; this script
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# rewrites it only when the emitted firmware bytes actually change.
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#
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# Comments and indentation are stripped before compressing (see strip_source).
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# The source page is heavily commented by house style and none of it is worth
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# flash, so the page ships smaller than it reads.
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#
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# Output: src/helpers/esp32/WebConfigHtml.h
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# WEBCONFIG_HTML_LOADER[] - small bootstrap page (PROGMEM)
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# WEBCONFIG_HTML_BR[] - complete Brotli-compressed page (PROGMEM)
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# WEBCONFIG_HTML_ETAG - quoted strong ETag for the loader page
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#
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# Runnable outside SCons to inspect exactly what gets shipped:
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# python3 scripts/generate_webconfig_html.py --emit /tmp/shipped.html
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# or served directly by the mock backend with its --minify flag.
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import hashlib
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import os
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import sys
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try:
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Import("env") # noqa: F821
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except NameError:
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pass # running standalone (--emit), not as a PIO extra_script
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SOURCE = os.path.join("webui", "index.html")
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OUTPUT = os.path.join("src", "helpers", "esp32", "WebConfigHtml.h")
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# __file__ is not defined inside PIO/SCons-executed extra_scripts
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HASH_MARKER = "// shipped-page-sha256: "
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sys.path.insert(0, os.path.join(os.getcwd(), "scripts"))
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from webconfig_minify import check_stripped, strip_source # noqa: E402
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from brotli_compress import BROTLI_VERSION, LGWIN, QUALITY, compress_html # noqa: E402
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def status(msg):
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sys.stderr.write("WebConfig HTML: %s\n" % msg)
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def content_hash(raw):
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"""Identify the bytes that the device actually serves.
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Do not hash this generator or the minifier source: a comment-only tooling
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edit must not dirty the checked-in firmware header. Generator changes are
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still safe because main() renders the candidate header and compares its
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full byte sequence before deciding whether to write.
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"""
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return hashlib.sha256(raw).hexdigest()
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def shipped_page():
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"""The exact bytes the device serves: the source page, stripped."""
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with open(SOURCE, "r", encoding="utf-8") as f:
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raw = f.read()
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stripped = strip_source(raw)
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problem = check_stripped(raw, stripped)
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if problem:
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status("ERROR: comment stripping corrupted the page (%s)" % problem)
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sys.exit(2)
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return raw, stripped
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def append_byte_array(lines, name, data):
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lines.append("const uint8_t %s[] PROGMEM = {" % name)
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for i in range(0, len(data), 16):
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chunk = data[i:i + 16]
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lines.append(" " + "".join("0x%02x," % b for b in chunk))
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lines.append("};")
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def main():
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if not os.path.isfile(SOURCE):
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status("ERROR: %s not found" % SOURCE)
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sys.exit(2)
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if "--emit" in sys.argv:
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dest = sys.argv[sys.argv.index("--emit") + 1]
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src, stripped = shipped_page()
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with open(dest, "w", encoding="utf-8") as f:
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f.write(stripped)
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status("%s -> %s (%d -> %d bytes)" % (SOURCE, dest, len(src), len(stripped)))
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return
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src, stripped = shipped_page()
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raw = stripped.encode("utf-8")
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src_hash = content_hash(raw)
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br = compress_html(raw)
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version = hashlib.sha256(br).hexdigest()[:16]
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loader = ("<!doctype html><meta charset=utf-8><meta name=viewport "
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"content=\"width=device-width,initial-scale=1\"><title>MeshCore "
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"WebConfig</title><body>Loading MeshCore WebConfig…<script>"
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"(async()=>{let p;for(let n=0;n<3&&p===undefined;n++){const C="
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"window.AbortController,c=C&&new C(),t=c&&setTimeout(()=>c.abort()"
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",90000);try{const r=await fetch(\"/ui?v=%s\",c?{signal:c.signal}"
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":{});if(r.ok)p=await r.text();else if(r.status===409)return "
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"location.reload()}catch(e){}finally{if(t)clearTimeout(t)}if(p==="
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"undefined)await new Promise(r=>setTimeout(r,500*(n+1)))}if(p==="
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"undefined)throw Error(\"transfer failed\");document.open();"
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"document.write(p);document.close()})().catch(e=>"
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"document.body.textContent=\"Unable to load WebConfig: \"+e+"
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"\". Reload to retry.\")</script>" % version)
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loader_bytes = loader.encode("utf-8")
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etag = hashlib.sha256(loader_bytes).hexdigest()[:16]
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lines = []
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lines.append("// Auto-generated by scripts/generate_webconfig_html.py from %s" % SOURCE.replace(os.sep, "/"))
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lines.append("// DO NOT EDIT - edit webui/index.html instead.")
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lines.append("// Compressed with Google Brotli %s (quality %d, lgwin %d)." %
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(BROTLI_VERSION, QUALITY, LGWIN))
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lines.append("%s%s" % (HASH_MARKER, src_hash))
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lines.append("#pragma once")
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lines.append("#include <stdint.h>")
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lines.append("#include <pgmspace.h>")
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lines.append("")
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lines.append("const uint32_t WEBCONFIG_HTML_RAW_LEN = %d;" % len(raw))
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lines.append("const uint32_t WEBCONFIG_HTML_BR_LEN = %d;" % len(br))
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lines.append('const char WEBCONFIG_HTML_ETAG[] = "\\"%s\\"";' % etag)
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lines.append('const char WEBCONFIG_HTML_VERSION[] = "%s";' % version)
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lines.append("const uint16_t WEBCONFIG_HTML_LOADER_LEN = %d;" % len(loader_bytes))
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append_byte_array(lines, "WEBCONFIG_HTML_LOADER", loader_bytes)
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lines.append("")
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append_byte_array(lines, "WEBCONFIG_HTML_BR", br)
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lines.append("")
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rendered = "\n".join(lines)
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try:
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with open(OUTPUT, "r", encoding="utf-8", newline="") as f:
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if f.read() == rendered:
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return
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except OSError:
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pass
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os.makedirs(os.path.dirname(OUTPUT), exist_ok=True)
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with open(OUTPUT, "w", encoding="utf-8", newline="") as f:
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f.write(rendered)
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status("%s -> %s (%d bytes source, %d stripped, %d Brotli)"
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% (SOURCE, OUTPUT, len(src.encode("utf-8")), len(raw), len(br)))
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# This script is attached only to esp32_base. Generate unconditionally here:
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# CPPDEFINES is not fully resolved when PlatformIO loads pre-scripts, so trying
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# to detect the final role at this point can leave a stale embedded page.
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# Non-WebConfig ESP32 builds do not compile the generated data into firmware.
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main()
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