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| 1 | +server { |
| 2 | + listen 80; |
| 3 | + server_name img.yourdomain.net; |
| 4 | + access_log /var/log/nginx/img.yourdomain.net_access.log; |
| 5 | + error_log /var/log/nginx/img.yourdomain.net_error.log; |
| 6 | + root /var/lib/imgroot; |
| 7 | + |
| 8 | + location / { |
| 9 | + #let the ngx.var.uri available |
| 10 | + set $tmpuri $uri; |
| 11 | + |
| 12 | + rewrite_by_lua ' |
| 13 | + local imgrootdir = "/var/lib/imgroot" |
| 14 | + local lfs = require("lfs") |
| 15 | + local fpath = imgrootdir .. ngx.var.uri |
| 16 | + local ft = lfs.attributes(fpath, "mode") |
| 17 | + if ft == nil then |
| 18 | + local dir,file = string.match(ngx.var.uri, "(.*/)(.*)") |
| 19 | + if file == nil then |
| 20 | + ngx.log(ngx.ERR, "Invalid image file \'"..ngx.var.uri.."\'") |
| 21 | + ngx.exit(404) |
| 22 | + else |
| 23 | + local base,op,w,h,ext = string.match(file, "(.*)_([CS])_(%d+)x(%d+)%.(.*)") |
| 24 | + if op ~= "C" and op ~= "S" then |
| 25 | + return |
| 26 | + end |
| 27 | + if w == nil or h == nil then |
| 28 | + ngx.log(ngx.ERR, "Invalid spec") |
| 29 | + ngx.exit(404) |
| 30 | + end |
| 31 | + local orig = imgrootdir .. dir .. base .. "." .. ext |
| 32 | + local ft = lfs.attributes(orig, "mode") |
| 33 | + if ft == nil then |
| 34 | + ngx.log(ngx.ERR, string.format("File %s not found", orig)) |
| 35 | + ngx.exit(404) |
| 36 | + end |
| 37 | + local cmd = string.format("/usr/bin/gm identify -format \'%%wx%%h\' \'%s\'", orig) |
| 38 | + local stdout = io.popen(cmd) |
| 39 | + local txt = stdout.read(stdout) |
| 40 | + local ow,oh = string.match(txt, "(%d+)x(%d+)") |
| 41 | + if ow == nil or oh == nil then |
| 42 | + ngx.log(ngx.ERR, string.format("Unable to decode the original file %s", orig)) |
| 43 | + ngx.exit(404) |
| 44 | + end |
| 45 | + |
| 46 | + w = tonumber(w) |
| 47 | + h = tonumber(h) |
| 48 | + ow = tonumber(ow) |
| 49 | + oh = tonumber(oh) |
| 50 | + if w == ow and h == oh then |
| 51 | + local uri = dir .. base .. "." .. ext |
| 52 | + ngx.req.set_uri(uri, true) |
| 53 | + return |
| 54 | + end |
| 55 | + local offx, offy, nw, nh |
| 56 | + if op == "C" then |
| 57 | + local wr = w / ow |
| 58 | + local hr = h / oh |
| 59 | + local r = math.max(wr, hr) |
| 60 | + nw = math.min(ow, w / r) |
| 61 | + nh = math.min(oh, h / r) |
| 62 | + offx = (ow - nw) / 2 |
| 63 | + offy = (oh - nh) / 2 |
| 64 | + w = math.min(w , nw) |
| 65 | + h = math.min(h , nh) |
| 66 | + end |
| 67 | + |
| 68 | + local dstdir = imgrootdir .. dir |
| 69 | + local dstfnm = dstdir .. file |
| 70 | + local cmd = nil |
| 71 | + if op == "C" then |
| 72 | + cmd = string.format("/usr/bin/gm convert \'%s\' -crop %dx%d+%d+%d -resize %dx%d \'%s\'", orig, nw, nh, offx, offy, w, h, dstfnm) |
| 73 | + else |
| 74 | + cmd = string.format("/usr/bin/gm convert \'%s\' -thumbnail %dx%d -background white -gravity center -extent %dx%d \'%s\'", orig, w, h, w, h, dstfnm) |
| 75 | + end |
| 76 | + local ec = os.execute(cmd) |
| 77 | + if ec ~= 0 then |
| 78 | + ngx.log(ngx.ERR, string.format("Create thumbnail fail , exit code is %d, cmd is %s", ec, cmd)) |
| 79 | + ngx.exit(404) |
| 80 | + end |
| 81 | + end |
| 82 | + end |
| 83 | + '; |
| 84 | + } |
| 85 | + |
| 86 | + error_page 500 502 503 504 /50x.html; |
| 87 | + location = /50x.html { |
| 88 | + root html; |
| 89 | + } |
| 90 | +} |
| 91 | + |
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