Day 2 Afternoon Exercises

    (back to exercise)

    2. //
    3. // Licensed under the Apache License, Version 2.0 (the "License");
    4. // you may not use this file except in compliance with the License.
    5. // You may obtain a copy of the License at
    6. //
    7. //      http://www.apache.org/licenses/LICENSE-2.0
    8. //
    9. // Unless required by applicable law or agreed to in writing, software
    10. // distributed under the License is distributed on an "AS IS" BASIS,
    11. // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12. // See the License for the specific language governing permissions and
    13. // limitations under the License.
    15. // ANCHOR: prefix_matches
    16. pub fn prefix_matches(prefix: &str, request_path: &str) -> bool {
    17.     // ANCHOR_END: prefix_matches
    18.     let prefixes = prefix.split('/');
    19.     let request_paths = request_path
    20.         .split('/')
    21.         .map(|p| Some(p))
    22.         .chain(std::iter::once(None));
    23.     for (prefix, request_path) in prefixes.zip(request_paths) {
    25.             Some(request_path) => {
    26.                 if (prefix != "*") && (prefix != request_path) {
    27.                     return false;
    28.                 }
    29.             }
    30.             None => return false,
    31.         }
    32.     }
    33.     true
    34. }
    36. // ANCHOR: unit-tests
    37. #[test]
    38. fn test_matches_without_wildcard() {
    39.     assert!(prefix_matches("/v1/publishers", "/v1/publishers"));
    40.     assert!(prefix_matches("/v1/publishers", "/v1/publishers/abc-123"));
    41.     assert!(prefix_matches("/v1/publishers", "/v1/publishers/abc/books"));
    43.     assert!(!prefix_matches("/v1/publishers", "/v1"));
    44.     assert!(!prefix_matches("/v1/publishers", "/v1/publishersBooks"));
    45.     assert!(!prefix_matches("/v1/publishers", "/v1/parent/publishers"));
    46. }
    48. fn test_matches_with_wildcard() {
    49.     assert!(prefix_matches(
    50.         "/v1/publishers/*/books",
    51.         "/v1/publishers/foo/books"
    52.     ));
    53.     assert!(prefix_matches(
    54.         "/v1/publishers/*/books",
    55.         "/v1/publishers/bar/books"
    56.     ));
    57.     assert!(prefix_matches(
    58.         "/v1/publishers/*/books",
    59.         "/v1/publishers/foo/books/book1"
    60.     ));
    62.     assert!(!prefix_matches("/v1/publishers/*/books", "/v1/publishers"));
    63.     assert!(!prefix_matches(
    64.         "/v1/publishers/*/books",
    65.         "/v1/publishers/foo/booksByAuthor"
    66.     ));
    67. }
    68. // ANCHOR_END: unit-tests
    70. fn main() {}