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| 1 | +package io.github.talelin.merak.extensions.file; |
| 2 | + |
| 3 | +import io.github.talelin.autoconfigure.exception.*; |
| 4 | +import org.springframework.util.MultiValueMap; |
| 5 | +import org.springframework.web.multipart.MultipartFile; |
| 6 | + |
| 7 | +import java.util.ArrayList; |
| 8 | +import java.util.List; |
| 9 | +import java.util.UUID; |
| 10 | + |
| 11 | +/** |
| 12 | + * 文件上传类的基类 |
| 13 | + * 模版模式 |
| 14 | + */ |
| 15 | +public abstract class AbstractUploader implements Uploader { |
| 16 | + |
| 17 | + private PreHandler preHandler; |
| 18 | + |
| 19 | + public List<File> upload(MultiValueMap<String, MultipartFile> fileMap) { |
| 20 | + checkFileMap(fileMap); |
| 21 | + // 得到单个文件的大小限制 |
| 22 | + // 本地存储需先初始化存储文件夹 |
| 23 | + return handleMultipartFiles(fileMap); |
| 24 | + } |
| 25 | + |
| 26 | + public List<File> upload(MultiValueMap<String, MultipartFile> fileMap, PreHandler preHandler) { |
| 27 | + this.preHandler = preHandler; |
| 28 | + return this.upload(fileMap); |
| 29 | + } |
| 30 | + |
| 31 | + protected List<File> handleMultipartFiles(MultiValueMap<String, MultipartFile> fileMap) { |
| 32 | + long singleFileLimit = getSingleFileLimit(); |
| 33 | + List<File> res = new ArrayList<>(); |
| 34 | + fileMap.keySet().forEach(key -> fileMap.get(key).forEach(file -> { |
| 35 | + if (!file.isEmpty()) { |
| 36 | + handleOneFile0(res, singleFileLimit, file); |
| 37 | + } |
| 38 | + })); |
| 39 | + return res; |
| 40 | + } |
| 41 | + |
| 42 | + private void handleOneFile0(List<File> res, long singleFileLimit, MultipartFile file) { |
| 43 | + byte[] bytes = getFileBytes(file); |
| 44 | + String[] include = getFileProperties().getInclude(); |
| 45 | + String[] exclude = getFileProperties().getExclude(); |
| 46 | + String ext = checkOneFile(include, exclude, singleFileLimit, file.getOriginalFilename(), bytes.length); |
| 47 | + String newFilename = getNewFilename(ext); |
| 48 | + String storePath = getStorePath(newFilename); |
| 49 | + // 生成文件的md5值 |
| 50 | + String md5 = FileUtil.getFileMD5(bytes); |
| 51 | + File fileData = File.builder(). |
| 52 | + name(newFilename). |
| 53 | + md5(md5). |
| 54 | + path(storePath). |
| 55 | + size(bytes.length). |
| 56 | + type(getFileType()). |
| 57 | + extension(ext). |
| 58 | + build(); |
| 59 | + // 如果预处理器不为空，且处理结果为false，直接返回, 否则处理 |
| 60 | + if (preHandler != null && !preHandler.handle(fileData)) |
| 61 | + return; |
| 62 | + boolean ok = handleOneFile(bytes, newFilename); |
| 63 | + if (ok) { |
| 64 | + res.add(fileData); |
| 65 | + } |
| 66 | + } |
| 67 | + |
| 68 | + private long getSingleFileLimit() { |
| 69 | + String singleLimit = getFileProperties().getSingleLimit(); |
| 70 | + return FileUtil.parseSize(singleLimit); |
| 71 | + } |
| 72 | + |
| 73 | + /** |
| 74 | + * 得到文件配置 |
| 75 | + * |
| 76 | + * @return 文件配置 |
| 77 | + */ |
| 78 | + protected abstract FileProperties getFileProperties(); |
| 79 | + |
| 80 | + /** |
| 81 | + * 处理一个文件 |
| 82 | + */ |
| 83 | + protected abstract boolean handleOneFile(byte[] bytes, String newFilename); |
| 84 | + |
| 85 | + /** |
| 86 | + * 返回文件路径 |
| 87 | + * |
| 88 | + * @param newFilename 文件名 |
| 89 | + * @return 文件路径 |
| 90 | + */ |
| 91 | + protected abstract String getStorePath(String newFilename); |
| 92 | + |
| 93 | + /** |
| 94 | + * 返回文件存储位置类型 |
| 95 | + * |
| 96 | + * @return LOCAL ｜ REMOTE |
| 97 | + */ |
| 98 | + protected abstract String getFileType(); |
| 99 | + |
| 100 | + /** |
| 101 | + * 获得新文件的名称 |
| 102 | + * |
| 103 | + * @param ext 文件后缀 |
| 104 | + * @return 新名称 |
| 105 | + */ |
| 106 | + protected String getNewFilename(String ext) { |
| 107 | + String uuid = UUID.randomUUID().toString().replace("-", ""); |
| 108 | + return uuid + ext; |
| 109 | + } |
| 110 | + |
| 111 | + /** |
| 112 | + * 检查文件 |
| 113 | + */ |
| 114 | + protected void checkFileMap(MultiValueMap<String, MultipartFile> fileMap) { |
| 115 | + if (fileMap.isEmpty()) { |
| 116 | + throw new NotFoundException("file not found", 10026); |
| 117 | + } |
| 118 | + int nums = getFileProperties().getNums(); |
| 119 | + if (fileMap.size() > nums) { |
| 120 | + throw new FileTooManyException("too many files, amount of files must less than" + nums, 10180); |
| 121 | + } |
| 122 | + } |
| 123 | + |
| 124 | + /** |
| 125 | + * 获得文件的字节 |
| 126 | + * |
| 127 | + * @param file 文件 |
| 128 | + * @return 字节 |
| 129 | + */ |
| 130 | + protected byte[] getFileBytes(MultipartFile file) { |
| 131 | + byte[] bytes; |
| 132 | + try { |
| 133 | + bytes = file.getBytes(); |
| 134 | + } catch (Exception e) { |
| 135 | + throw new FailedException("read file date failed", 10190); |
| 136 | + } |
| 137 | + return bytes; |
| 138 | + } |
| 139 | + |
| 140 | + /** |
| 141 | + * 单个文件检查 |
| 142 | + * |
| 143 | + * @param singleFileLimit 单个文件大小限制 |
| 144 | + * @param originName 文件原始名称 |
| 145 | + * @param length 文件大小 |
| 146 | + * @return 文件的扩展名，例如： .jpg |
| 147 | + */ |
| 148 | + protected String checkOneFile(String[] include, String[] exclude, long singleFileLimit, String originName, int length) { |
| 149 | + // 写到了本地 |
| 150 | + String ext = FileUtil.getFileExt(originName); |
| 151 | + // 检测扩展 |
| 152 | + if (!this.checkExt(include, exclude, ext)) { |
| 153 | + throw new FileExtensionException(ext + "文件类型不支持"); |
| 154 | + } |
| 155 | + // 检测单个大小 |
| 156 | + if (length > singleFileLimit) { |
| 157 | + throw new FileTooLargeException(originName + "文件不能超过" + singleFileLimit); |
| 158 | + } |
| 159 | + return ext; |
| 160 | + } |
| 161 | + |
| 162 | + /** |
| 163 | + * 检查文件后缀 |
| 164 | + * |
| 165 | + * @param ext 后缀名 |
| 166 | + * @return 是否通过 |
| 167 | + */ |
| 168 | + protected boolean checkExt(String[] include, String[] exclude, String ext) { |
| 169 | + int inLen = include == null ? 0 : include.length; |
| 170 | + int exLen = exclude == null ? 0 : exclude.length; |
| 171 | + // 如果两者都有取 include，有一者则用一者 |
| 172 | + if (inLen > 0 && exLen > 0) { |
| 173 | + return this.findInInclude(include, ext); |
| 174 | + } else if (inLen > 0) { |
| 175 | + // 有include，无exclude |
| 176 | + return this.findInInclude(include, ext); |
| 177 | + } else if (exLen > 0) { |
| 178 | + // 有exclude，无include |
| 179 | + return this.findInExclude(exclude, ext); |
| 180 | + } else { |
| 181 | + // 二者都没有 |
| 182 | + return true; |
| 183 | + } |
| 184 | + } |
| 185 | + |
| 186 | + protected boolean findInInclude(String[] include, String ext) { |
| 187 | + for (String s : include) { |
| 188 | + if (s.equals(ext)) { |
| 189 | + return true; |
| 190 | + } |
| 191 | + } |
| 192 | + return false; |
| 193 | + } |
| 194 | + |
| 195 | + protected boolean findInExclude(String[] exclude, String ext) { |
| 196 | + for (String s : exclude) { |
| 197 | + if (s.equals(ext)) { |
| 198 | + return true; |
| 199 | + } |
| 200 | + } |
| 201 | + return false; |
| 202 | + } |
| 203 | +} |
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