This file is indexed.

/usr/share/php/JmesPath/FnDispatcher.php is in php-jmespath 2.3.0-2ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
<?php
namespace JmesPath;

/**
 * Dispatches to named JMESPath functions using a single function that has the
 * following signature:
 *
 *     mixed $result = fn(string $function_name, array $args)
 */
class FnDispatcher
{
    /**
     * Gets a cached instance of the default function implementations.
     *
     * @return FnDispatcher
     */
    public static function getInstance()
    {
        static $instance = null;
        if (!$instance) {
            $instance = new self();
        }

        return $instance;
    }

    /**
     * @param string $fn   Function name.
     * @param array  $args Function arguments.
     *
     * @return mixed
     */
    public function __invoke($fn, array $args)
    {
        return $this->{'fn_' . $fn}($args);
    }

    private function fn_abs(array $args)
    {
        $this->validate('abs', $args, [['number']]);
        return abs($args[0]);
    }

    private function fn_avg(array $args)
    {
        $this->validate('avg', $args, [['array']]);
        $sum = $this->reduce('avg:0', $args[0], ['number'], function ($a, $b) {
            return $a + $b;
        });
        return $args[0] ? ($sum / count($args[0])) : null;
    }

    private function fn_ceil(array $args)
    {
        $this->validate('ceil', $args, [['number']]);
        return ceil($args[0]);
    }

    private function fn_contains(array $args)
    {
        $this->validate('contains', $args, [['string', 'array'], ['any']]);
        if (is_array($args[0])) {
            return in_array($args[1], $args[0]);
        } elseif (is_string($args[1])) {
            return strpos($args[0], $args[1]) !== false;
        } else {
            return null;
        }
    }

    private function fn_ends_with(array $args)
    {
        $this->validate('ends_with', $args, [['string'], ['string']]);
        list($search, $suffix) = $args;
        return $suffix === '' || substr($search, -strlen($suffix)) === $suffix;
    }

    private function fn_floor(array $args)
    {
        $this->validate('floor', $args, [['number']]);
        return floor($args[0]);
    }

    private function fn_not_null(array $args)
    {
        if (!$args) {
            throw new \RuntimeException(
                "not_null() expects 1 or more arguments, 0 were provided"
            );
        }

        return array_reduce($args, function ($carry, $item) {
            return $carry !== null ? $carry : $item;
        });
    }

    private function fn_join(array $args)
    {
        $this->validate('join', $args, [['string'], ['array']]);
        $fn = function ($a, $b, $i) use ($args) {
            return $i ? ($a . $args[0] . $b) : $b;
        };
        return $this->reduce('join:0', $args[1], ['string'], $fn);
    }

    private function fn_keys(array $args)
    {
        $this->validate('keys', $args, [['object']]);
        return array_keys((array) $args[0]);
    }

    private function fn_length(array $args)
    {
        $this->validate('length', $args, [['string', 'array', 'object']]);
        return is_string($args[0]) ? strlen($args[0]) : count((array) $args[0]);
    }

    private function fn_max(array $args)
    {
        $this->validate('max', $args, [['array']]);
        $fn = function ($a, $b) { return $a >= $b ? $a : $b; };
        return $this->reduce('max:0', $args[0], ['number', 'string'], $fn);
    }

    private function fn_max_by(array $args)
    {
        $this->validate('max_by', $args, [['array'], ['expression']]);
        $expr = $this->wrapExpression('max_by:1', $args[1], ['number', 'string']);
        $fn = function ($carry, $item, $index) use ($expr) {
            return $index
                ? ($expr($carry) >= $expr($item) ? $carry : $item)
                : $item;
        };
        return $this->reduce('max_by:1', $args[0], ['any'], $fn);
    }

    private function fn_min(array $args)
    {
        $this->validate('min', $args, [['array']]);
        $fn = function ($a, $b, $i) { return $i && $a <= $b ? $a : $b; };
        return $this->reduce('min:0', $args[0], ['number', 'string'], $fn);
    }

    private function fn_min_by(array $args)
    {
        $this->validate('min_by', $args, [['array'], ['expression']]);
        $expr = $this->wrapExpression('min_by:1', $args[1], ['number', 'string']);
        $i = -1;
        $fn = function ($a, $b) use ($expr, &$i) {
            return ++$i ? ($expr($a) <= $expr($b) ? $a : $b) : $b;
        };
        return $this->reduce('min_by:1', $args[0], ['any'], $fn);
    }

    private function fn_reverse(array $args)
    {
        $this->validate('reverse', $args, [['array', 'string']]);
        if (is_array($args[0])) {
            return array_reverse($args[0]);
        } elseif (is_string($args[0])) {
            return strrev($args[0]);
        } else {
            throw new \RuntimeException('Cannot reverse provided argument');
        }
    }

    private function fn_sum(array $args)
    {
        $this->validate('sum', $args, [['array']]);
        $fn = function ($a, $b) { return $a + $b; };
        return $this->reduce('sum:0', $args[0], ['number'], $fn);
    }

    private function fn_sort(array $args)
    {
        $this->validate('sort', $args, [['array']]);
        $valid = ['string', 'number'];
        return Utils::stableSort($args[0], function ($a, $b) use ($valid) {
            $this->validateSeq('sort:0', $valid, $a, $b);
            return strnatcmp($a, $b);
        });
    }

    private function fn_sort_by(array $args)
    {
        $this->validate('sort_by', $args, [['array'], ['expression']]);
        $expr = $args[1];
        $valid = ['string', 'number'];
        return Utils::stableSort(
            $args[0],
            function ($a, $b) use ($expr, $valid) {
                $va = $expr($a);
                $vb = $expr($b);
                $this->validateSeq('sort_by:0', $valid, $va, $vb);
                return strnatcmp($va, $vb);
            }
        );
    }

    private function fn_starts_with(array $args)
    {
        $this->validate('starts_with', $args, [['string'], ['string']]);
        list($search, $prefix) = $args;
        return $prefix === '' || strpos($search, $prefix) === 0;
    }

    private function fn_type(array $args)
    {
        $this->validateArity('type', count($args), 1);
        return Utils::type($args[0]);
    }

    private function fn_to_string(array $args)
    {
        $this->validateArity('to_string', count($args), 1);
        $v = $args[0];
        if (is_string($v)) {
            return $v;
        } elseif (is_object($v)
            && !($v instanceof \JsonSerializable)
            && method_exists($v, '__toString')
        ) {
            return (string) $v;
        }

        return json_encode($v);
    }

    private function fn_to_number(array $args)
    {
        $this->validateArity('to_number', count($args), 1);
        $value = $args[0];
        $type = Utils::type($value);
        if ($type == 'number') {
            return $value;
        } elseif ($type == 'string' && is_numeric($value)) {
            return strpos($value, '.') ? (float) $value : (int) $value;
        } else {
            return null;
        }
    }

    private function fn_values(array $args)
    {
        $this->validate('values', $args, [['array', 'object']]);
        return array_values((array) $args[0]);
    }

    private function fn_merge(array $args)
    {
        if (!$args) {
            throw new \RuntimeException(
                "merge() expects 1 or more arguments, 0 were provided"
            );
        }

        return call_user_func_array('array_replace', $args);
    }

    private function fn_to_array(array $args)
    {
        $this->validate('to_array', $args, [['any']]);

        return Utils::isArray($args[0]) ? $args[0] : [$args[0]];
    }

    private function fn_map(array $args)
    {
        $this->validate('map', $args, [['expression'], ['any']]);
        $result = [];
        foreach ($args[1] as $a) {
            $result[] = $args[0]($a);
        }
        return $result;
    }

    private function typeError($from, $msg)
    {
        if (strpos($from, ':')) {
            list($fn, $pos) = explode(':', $from);
            throw new \RuntimeException(
                sprintf('Argument %d of %s %s', $pos, $fn, $msg)
            );
        } else {
            throw new \RuntimeException(
                sprintf('Type error: %s %s', $from, $msg)
            );
        }
    }

    private function validateArity($from, $given, $expected)
    {
        if ($given != $expected) {
            $err = "%s() expects {$expected} arguments, {$given} were provided";
            throw new \RuntimeException(sprintf($err, $from));
        }
    }

    private function validate($from, $args, $types = [])
    {
        $this->validateArity($from, count($args), count($types));
        foreach ($args as $index => $value) {
            if (!isset($types[$index]) || !$types[$index]) {
                continue;
            }
            $this->validateType("{$from}:{$index}", $value, $types[$index]);
        }
    }

    private function validateType($from, $value, array $types)
    {
        if ($types[0] == 'any'
            || in_array(Utils::type($value), $types)
            || ($value === [] && in_array('object', $types))
        ) {
            return;
        }
        $msg = 'must be one of the following types: ' . implode(', ', $types)
            . '. ' . Utils::type($value) . ' found';
        $this->typeError($from, $msg);
    }

    /**
     * Validates value A and B, ensures they both are correctly typed, and of
     * the same type.
     *
     * @param string   $from   String of function:argument_position
     * @param array    $types  Array of valid value types.
     * @param mixed    $a      Value A
     * @param mixed    $b      Value B
     */
    private function validateSeq($from, array $types, $a, $b)
    {
        $ta = Utils::type($a);
        $tb = Utils::type($b);

        if ($ta !== $tb) {
            $msg = "encountered a type mismatch in sequence: {$ta}, {$tb}";
            $this->typeError($from, $msg);
        }

        $typeMatch = ($types && $types[0] == 'any') || in_array($ta, $types);
        if (!$typeMatch) {
            $msg = 'encountered a type error in sequence. The argument must be '
                . 'an array of ' . implode('|', $types) . ' types. '
                . "Found {$ta}, {$tb}.";
            $this->typeError($from, $msg);
        }
    }

    /**
     * Reduces and validates an array of values to a single value using a fn.
     *
     * @param string   $from   String of function:argument_position
     * @param array    $values Values to reduce.
     * @param array    $types  Array of valid value types.
     * @param callable $reduce Reduce function that accepts ($carry, $item).
     *
     * @return mixed
     */
    private function reduce($from, array $values, array $types, callable $reduce)
    {
        $i = -1;
        return array_reduce(
            $values,
            function ($carry, $item) use ($from, $types, $reduce, &$i) {
                if (++$i > 0) {
                    $this->validateSeq($from, $types, $carry, $item);
                }
                return $reduce($carry, $item, $i);
            }
        );
    }

    /**
     * Validates the return values of expressions as they are applied.
     *
     * @param string   $from  Function name : position
     * @param callable $expr  Expression function to validate.
     * @param array    $types Array of acceptable return type values.
     *
     * @return callable Returns a wrapped function
     */
    private function wrapExpression($from, callable $expr, array $types)
    {
        list($fn, $pos) = explode(':', $from);
        $from = "The expression return value of argument {$pos} of {$fn}";
        return function ($value) use ($from, $expr, $types) {
            $value = $expr($value);
            $this->validateType($from, $value, $types);
            return $value;
        };
    }

    /** @internal Pass function name validation off to runtime */
    public function __call($name, $args)
    {
        $name = str_replace('fn_', '', $name);
        throw new \RuntimeException("Call to undefined function {$name}");
    }
}