Golang Role.Paths方法代码示例

// Walk to parent, and either create or update this delegation.  We can only create a new delegation if we're given keys
// Ensure all updates are valid, by checking against parent ancestor paths and ensuring the keys meet the role threshold.
func delegationUpdateVisitor(roleName string, addKeys data.KeyList, removeKeys, addPaths, removePaths []string, clearAllPaths bool, newThreshold int) walkVisitorFunc {
	return func(tgt *data.SignedTargets, validRole data.DelegationRole) interface{} {
		var err error
		// Validate the changes underneath this restricted validRole for adding paths, reject invalid path additions
		if len(addPaths) != len(data.RestrictDelegationPathPrefixes(validRole.Paths, addPaths)) {
			return data.ErrInvalidRole{Role: roleName, Reason: "invalid paths to add to role"}
		}
		// Try to find the delegation and amend it using our changelist
		var delgRole *data.Role
		for _, role := range tgt.Signed.Delegations.Roles {
			if role.Name == roleName {
				// Make a copy and operate on this role until we validate the changes
				keyIDCopy := make([]string, len(role.KeyIDs))
				copy(keyIDCopy, role.KeyIDs)
				pathsCopy := make([]string, len(role.Paths))
				copy(pathsCopy, role.Paths)
				delgRole = &data.Role{
					RootRole: data.RootRole{
						KeyIDs:    keyIDCopy,
						Threshold: role.Threshold,
					},
					Name:  role.Name,
					Paths: pathsCopy,
				}
				delgRole.RemovePaths(removePaths)
				if clearAllPaths {
					delgRole.Paths = []string{}
				}
				delgRole.AddPaths(addPaths)
				delgRole.RemoveKeys(removeKeys)
				break
			}
		}
		// We didn't find the role earlier, so create it only if we have keys to add
		if delgRole == nil {
			if len(addKeys) > 0 {
				delgRole, err = data.NewRole(roleName, newThreshold, addKeys.IDs(), addPaths)
				if err != nil {
					return err
				}
			} else {
				// If we can't find the role and didn't specify keys to add, this is an error
				return data.ErrInvalidRole{Role: roleName, Reason: "cannot create new delegation without keys"}
			}
		}
		// Add the key IDs to the role and the keys themselves to the parent
		for _, k := range addKeys {
			if !utils.StrSliceContains(delgRole.KeyIDs, k.ID()) {
				delgRole.KeyIDs = append(delgRole.KeyIDs, k.ID())
			}
		}
		// Make sure we have a valid role still
		if len(delgRole.KeyIDs) < delgRole.Threshold {
			return data.ErrInvalidRole{Role: roleName, Reason: "insufficient keys to meet threshold"}
		}
		// NOTE: this closure CANNOT error after this point, as we've committed to editing the SignedTargets metadata in the repo object.
		// Any errors related to updating this delegation must occur before this point.
		// If all of our changes were valid, we should edit the actual SignedTargets to match our copy
		for _, k := range addKeys {
			tgt.Signed.Delegations.Keys[k.ID()] = k
		}
		foundAt := utils.FindRoleIndex(tgt.Signed.Delegations.Roles, delgRole.Name)
		if foundAt < 0 {
			tgt.Signed.Delegations.Roles = append(tgt.Signed.Delegations.Roles, delgRole)
		} else {
			tgt.Signed.Delegations.Roles[foundAt] = delgRole
		}
		tgt.Dirty = true
		utils.RemoveUnusedKeys(tgt)
		return StopWalk{}
	}
}