(r *http.Request, src, dst string)
| 120 | } |
| 121 | |
| 122 | func (h *Handler) confirmLocks(r *http.Request, src, dst string) (release func(), status int, err error) { |
| 123 | hdr := r.Header.Get("If") |
| 124 | if hdr == "" { |
| 125 | // An empty If header means that the client hasn't previously created locks. |
| 126 | // Even if this client doesn't care about locks, we still need to check that |
| 127 | // the resources aren't locked by another client, so we create temporary |
| 128 | // locks that would conflict with another client's locks. These temporary |
| 129 | // locks are unlocked at the end of the HTTP request. |
| 130 | now, srcToken, dstToken := time.Now(), "", "" |
| 131 | if src != "" { |
| 132 | srcToken, status, err = h.lock(now, src) |
| 133 | if err != nil { |
| 134 | return nil, status, err |
| 135 | } |
| 136 | } |
| 137 | if dst != "" { |
| 138 | dstToken, status, err = h.lock(now, dst) |
| 139 | if err != nil { |
| 140 | if srcToken != "" { |
| 141 | h.LockSystem.Unlock(now, srcToken) |
| 142 | } |
| 143 | return nil, status, err |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | return func() { |
| 148 | if dstToken != "" { |
| 149 | h.LockSystem.Unlock(now, dstToken) |
| 150 | } |
| 151 | if srcToken != "" { |
| 152 | h.LockSystem.Unlock(now, srcToken) |
| 153 | } |
| 154 | }, 0, nil |
| 155 | } |
| 156 | |
| 157 | ih, ok := parseIfHeader(hdr) |
| 158 | if !ok { |
| 159 | return nil, http.StatusBadRequest, errInvalidIfHeader |
| 160 | } |
| 161 | // ih is a disjunction (OR) of ifLists, so any ifList will do. |
| 162 | for _, l := range ih.lists { |
| 163 | lsrc := l.resourceTag |
| 164 | if lsrc == "" { |
| 165 | lsrc = src |
| 166 | } else { |
| 167 | u, err := url.Parse(lsrc) |
| 168 | if err != nil { |
| 169 | continue |
| 170 | } |
| 171 | if u.Host != r.Host { |
| 172 | continue |
| 173 | } |
| 174 | lsrc, status, err = h.stripPrefix(u.Path) |
| 175 | if err != nil { |
| 176 | return nil, status, err |
| 177 | } |
| 178 | } |
| 179 | release, err = h.LockSystem.Confirm(time.Now(), lsrc, dst, l.conditions...) |
no test coverage detected