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cfd4e8c46b
Matching multiples caused exceptions to be raised. This made it so
webhook notification POST bodies could not template things like the
image tags as `${tags[*]}`. This was caused by a typo in the jsonpath_rw
match field that was used.
Signed-off-by: Kalle Jillheden <kalle.jillheden@iver.se>
89 lines
2.4 KiB
Python
89 lines
2.4 KiB
Python
import json
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import re
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from jsonpath_rw import parse as parse_json_path
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from jsonpath_rw.lexer import JsonPathLexerError
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INLINE_PATH_PATTERN = r"\$\{([^}]*)\}"
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class JSONTemplateParseException(Exception):
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"""
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Exception raised if a JSON template could not be parsed.
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"""
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class JSONTemplate(object):
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"""
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Represents a parsed template for producing JSON.
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"""
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def __init__(self, template_string):
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try:
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self._parsed = json.loads(template_string)
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except ValueError as ve:
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raise JSONTemplateParseException("Could not parse template: %s" % ve)
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# Apply against an empty object to validate.
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self.apply({})
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def apply(self, data):
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return apply_data_to_obj(self._parsed, data)
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def apply_data_to_obj(obj, data, missing="(none)"):
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if isinstance(obj, str):
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return _process_string(obj, data, missing)
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elif isinstance(obj, dict):
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return {
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_process_string(key, data, missing): apply_data_to_obj(value, data, missing)
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for key, value in obj.items()
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}
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elif isinstance(obj, list):
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return [apply_data_to_obj(item, data, missing) for item in obj]
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else:
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return obj
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def _process_string(str_value, data, missing_filler):
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# Check for a direct match first.
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if re.match("^" + INLINE_PATH_PATTERN + "$", str_value):
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expression = str_value[2:-1]
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return _process_inline(expression, data)
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def process_inline(match):
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result = _process_inline(match.group(1), data)
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if result is None:
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return missing_filler
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if isinstance(result, list) and len(result) > 1:
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return ",".join(result)
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return str(result)
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return re.sub(INLINE_PATH_PATTERN, process_inline, str_value)
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def _process_inline(expression, data):
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if not expression:
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raise JSONTemplateParseException("Empty expression found")
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try:
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parsed = parse_json_path(expression)
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except JsonPathLexerError as jple:
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raise JSONTemplateParseException("For expression `%s`: %s" % (expression, jple))
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except Exception as ex:
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raise JSONTemplateParseException("For expression `%s`: %s" % (expression, ex))
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try:
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found = parsed.find(data)
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if not found:
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return None
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if len(found) > 1:
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return [f.value for f in found]
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return found[0].value
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except IndexError:
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return None
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