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105 lines
3.4 KiB
Go
105 lines
3.4 KiB
Go
// Copyright 2021 Harness Inc. All rights reserved.
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// Use of this source code is governed by the Polyform Free Trial License
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// that can be found in the LICENSE.md file for this repository.
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package check
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import (
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"fmt"
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"strings"
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"github.com/harness/gitness/types"
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"github.com/pkg/errors"
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)
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const (
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minPathSegments = 1
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maxPathSegmentsForSpace = 9
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maxPathSegments = 10
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)
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var (
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ErrPathEmpty = &CheckError{"Path can't be empty."}
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ErrPathInvalidSize = &CheckError{fmt.Sprintf("A path has to be between %d and %d segments long (%d for spaces).", minPathSegments, maxPathSegments, maxPathSegmentsForSpace)}
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ErrEmptyPathSegment = &CheckError{"Empty segments are not allowed."}
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ErrPathCantBeginOrEndWithSeparator = &CheckError{fmt.Sprintf("Path can't start or end with the separator ('%s').", types.PathSeparator)}
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ErrPathDifferentTopLevelSpace = &CheckError{"Alias paths have to stay within the same top level space."}
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ErrTopLevelPathNotAllowed = &CheckError{"Top level alias paths are not allowed."}
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)
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/*
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* Path checks the provided path and returns an error in it isn't valid.
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*
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* NOTE: A repository path can be one deeper than a space path (as otherwise the space would be useless)
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*/
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func Path(path string, isSpace bool) error {
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if path == "" {
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return ErrPathEmpty
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}
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// ensure path doesn't begin or end with /
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if path[:1] == types.PathSeparator || path[len(path)-1:] == types.PathSeparator {
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return ErrPathCantBeginOrEndWithSeparator
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}
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// ensure path is not too deep
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segments := strings.Split(path, types.PathSeparator)
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l := len(segments)
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if l < minPathSegments || (!isSpace && l > maxPathSegments) || (isSpace && l > maxPathSegmentsForSpace) {
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return ErrPathInvalidSize
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}
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// ensure all segments of the path are valid
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for _, s := range segments {
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if s == "" {
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return ErrEmptyPathSegment
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} else if err := Name(s); err != nil {
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return errors.Wrapf(err, "Invalid segment '%s'", s)
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}
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}
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return nil
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}
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/*
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* Validates a PathParams object that is used to create a new path.
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*
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* NOTES:
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* - We don't allow top level alias paths
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* - An alias path has to stay within the same top level space
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*
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* IMPORTANT:
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* Technically there can be a racing condition when a space is being moved inbetween the validation and path creation.
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* But that is fine, as the path could've also been created a second earlier when it was still valid and would then still exist.
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*/
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func PathParams(path *types.PathParams, currentPath string, isSpace bool) error {
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// ensure the path is valid
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if err := Path(path.Path, isSpace); err != nil {
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return err
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}
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// ensure the path is at least 1 level deep (at least one '/')
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i := strings.Index(path.Path, types.PathSeparator)
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if i < 0 {
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return ErrTopLevelPathNotAllowed
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}
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// ensure the top level space doesn't change (add path separator to avoid abcd -> abc matching)
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if !strings.HasPrefix(currentPath+types.PathSeparator, path.Path[:i]+types.PathSeparator) {
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return ErrPathDifferentTopLevelSpace
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}
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return nil
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}
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/*
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* Checks if the provided path is too long.
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*
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* NOTE: A repository path can be one deeper than a space path (as otherwise the space would be useless)
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*/
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func PathTooLong(path string, isSpace bool) bool {
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l := strings.Count(path, types.PathSeparator) + 1
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return (!isSpace && l > maxPathSegments) || (isSpace && l > maxPathSegmentsForSpace)
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}
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